Jumat, 29 Oktober 2010

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Athenian Prostitution: The Business of Sex, by Edward E. Cohen

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Athenian Prostitution: The Business of Sex, by Edward E. Cohen

This is a pioneering study that examines the sale of sex in classical Athens from a commercial (rather than from a cultural or moral) perspective. Following the author's earlier book on Athenian banking, this work analyzes erotic business at Athens in the context of the Athenian economy. For the Athenians, the social acceptability and moral standing of human labor was largely determined by the conditions under which work was performed. Pursued in a context characteristic of servile endeavor, prostitution--like all forms of slave labor--was contemptible. Pursued under conditions appropriate to non-servile endeavor, prostitution--like all forms of free labor--was not violative of Athenian work ethics. As a mercantile activity, however, prostitution was not untouched by Athenian antagonism toward commercial and manual pursuits; as the "business of sex," prostitution further evoked negativity from segments of Greek opinion uncomfortable with any form of carnality. Yet ancient sources also adumbrate another view, in which the sale of sex, lawful and indeed pervasive at Athens, is presented alluringly.

In a book that will be of interest to all students of sex and gender, to economic, legal and social historians, and to classicists, the author explores the high compensation earned by female sexual entrepreneurs who often controlled prostitutional businesses that were perpetuated from generation to generation on a matrilineal basis, and that benefitted from legislative restrictions on pimping. The author juxtaposes the widespread practice of "prostitution pursuant to written contract" with legislation targeting male prostitutes functioning as governmental leaders, and explores the seemingly contradictory phenomena of extensive sexual exploitation of slave prostitutes (male and female) coexisting with Athenian society's pride in its legislative protection of slaves and minors against sexual outrage.

  • Sales Rank: #347904 in Books
  • Published on: 2015-12-14
  • Original language: English
  • Number of items: 1
  • Dimensions: 6.60" h x 1.00" w x 9.40" l, .0 pounds
  • Binding: Hardcover
  • 264 pages

Review

"Every new book by Edward E. Cohen is an event and Athenian Prostitution is no exception to the rule. The originality of this work is to offer an unprecedented economic approach to the question of prostitution in fourth-century BCE Athens. Among others, it reveals that citizens, and not slaves only, could be prostitutes, despite the social opprobrium attached to this activity. The book thus exposes an aspect of ancient Athenian society that has been completely neglected so far. Well written, with many colorful and striking passages, from beginning to end the book proves to be a fascinating reading." --Alain Bresson, The University of Chicago


"An important and fascinating study of both male and female prostitution in Athens in all its aspects: economic, legal, social, and ideological. Athenian Prostitution should be read by anyone interested in the ancient economy, Athenian social history, ancient law, and the history of sexuality." --Adriaan Lanni, Harvard Law School


"Although the cultural aspects of prostitution in ancient Greece have been well covered by others, Cohen attempts to explore its commercial aspects via bold, fresh scholarshipEL. Taking a sensitive topic into a new scholarly direction marks Cohen's work as an important addition to the field of antiquityEL. Essential."-Choice


About the Author

Edward E. Cohen is Professor of Classical Studies and Ancient History (Adjunct) at the University of Pennsylvania.

Most helpful customer reviews

0 of 0 people found the following review helpful.
not only is it historically brilliant but also reads as a fascinating story about economics ...
By Josephine Linden
an outstanding story. not only is it historically brilliant but also reads as a fascinating story about economics and sociology
truly a fascinating work

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Kamis, 28 Oktober 2010

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  • Sales Rank: #122608 in Books
  • Brand: Brand: Child's World
  • Published on: 1998-08
  • Ingredients: Example Ingredients
  • Original language: English
  • Number of items: 1
  • Dimensions: .36" h x 9.30" w x 10.58" l,
  • Binding: Library Binding
  • 24 pages
Features
  • Example Bullet Point 1
  • Example Bullet Point 2

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1 of 1 people found the following review helpful.
Our boys love this book
By A Customer
Our 2 toddler boys really think GARBAGE truck are cool , They are big , make cool sounds .... This book is a great read for you & your child to sit together on a quiet night & read it a few times.

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Sabtu, 23 Oktober 2010

[V221.Ebook] Ebook Download International Trade in Agricultural Products, by Michael Reed

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International Trade in Agricultural Products, by Michael Reed

International Trade is vital to the agricultural sector in many countries of the world, especially the United States. International trade allows productive capacity in agriculture to expand without seriously eroding prices, and there is no question that trade will become more critical to many nations in the future. It is surprising, then, that there is no up-to-date text book at the undergraduate or graduate level that provides a complete treatment of the major issues in international agricultural trade. This book is an effort to provide that complete treatment. This book covers all the essential topics for an agricultural trade policy course: gains from trade, agricultural trade policies (of exporters and importers), exchange rates, and multilateral trade negotiations. These have been key elements in agricultural trade classes for decades. These topics are fundamental to understanding how the current trade regime works and which parties benefit and lose as the regime changes. The book also presents concepts on issues that have become more important to a fundamental understanding of agricultural trade: the environment, preferential trade agreements, technical barriers, and flexible exchange rates. Without a clear understanding of these new issues in agricultural trade, one cannot fathom where world agriculture has been and is going. The final four chapters of the book cover company issues that shed light on what helps firms succeed in international markets. This should help instructors who teach in programs that are more agribusiness oriented. The chapters on foreign direct investment and competitiveness take a large-picture view of factors influencing firm behavior and success, while the chapters on export analysis and strategy are oriented toward steps that firms must take in entering and expanding their international markets. The chapters on Europe and China are quite different than the others. The European Union is mentioned throughout the book, so it is important to understand the unique E.U. context. China has been such a large focus for food markets in recent years that it also merits a chapter. One cannot understand world agricultural markets without understanding these important countries. This text is written for those who have had an intermediate microeconomics class because trade issues can be understood best through extensive graphical analysis. The book attempts to make linkages back to everyday life through examples and case studies so that the learning experience is enhanced. Any professor can find numerous current events that support the chapters during a typical semester.

  • Sales Rank: #537017 in Books
  • Published on: 2016-01-07
  • Original language: English
  • Dimensions: 9.25" h x 1.04" w x 7.50" l,
  • Binding: Paperback
  • 458 pages

From the Back Cover

This book explores the broad issues and essential topics involved in international agricultural trade: agricultural policy, foreign direct investment, technical barriers, macroeconomics, the environment, preferential trade agreements. It presents this fundamental material as part of a complete treatment that offers students an understanding of how the current trade regime works, and which parties benefit and lose as the regime changes.Chapter topics include gains from trade, policies of importing and exporting companies, multilateral trade negotiations, European agriculture, and international marketing.For individuals with a background in intermediate microeconomics, ready for an extensive graphical analysis of trade issues.

Most helpful customer reviews

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Globalization& Trade in Agricultural products in LDCs
By Akila E. Taha
No doubt that the new economic order will cause some negative effects on the economies of the LDCs. The main effect is related to the prices of the agricultural products which will increase according to theGATT.Therefore this book highlights the international Trade trends in this field.Also, this book may help scholars and researchers in this field of study.

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Selasa, 19 Oktober 2010

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* Hollywood horror movies are NOT to be used as guides to living as a werewolf. Their goal is not to educate, but to entertain. As a result, they are largely ignorant of the realities of the condition.
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* You are not a monster.
The Werewolf's Guide to Life cuts through the fiction and guides you through your first transformation and beyond, offering indispensable advice on how to tell if you’re really a werewolf, post-attack etiquette, breaking the news to your spouse, avoiding government abduction, and how to not just survive, but thrive. You cannot afford to not read this book. Your very life depends on it.

  • Sales Rank: #807724 in Books
  • Brand: Brand: Three Rivers Press
  • Published on: 2009-09-15
  • Released on: 2009-09-15
  • Original language: English
  • Number of items: 1
  • Dimensions: 8.00" h x .67" w x 5.14" l, .52 pounds
  • Binding: Paperback
  • 256 pages
Features
  • Used Book in Good Condition

About the Author
RITCH DUNCAN and BOB POWERS have devoted their lives to aiding and serving the lycanthrope community. They live in New York City.

Illustrator EMILY FLAKE is a New York based cartoonist and illustrator who is grateful to have gotten close enough to study her subjects for this book without being torn limb from limb.

Most helpful customer reviews

29 of 34 people found the following review helpful.
Hysterical! A fun read!
By fancy femme
This book is really fun! A great book to gift to a friend. It's well written, clever and surprisingly chock full of fact.

It's also a good one to read on the bus, when you want the seat next to you to stay open and untaken. Especially if you read it at night, looking shifty and sweaty, with some claw marks put in the cover.

9 of 10 people found the following review helpful.
If You've Just Been Bitten, You Need to Get a Copy of This Before Your First Moons
By James N Simpson
Many people who suddenly are infected by the medical condition known as lycanthropy according to this book die before during their first transformation into a werewolf. The Werewolf's Guide to Life is just what the title suggests, a handy guide that tells you, the recently bitten one, what is about to happen to your body, how when you do transform into a werewolf you won't be able to control yourself from ripping apart any human in your vicinity, and the guide will stress over and over again how important it is that you restrain yourself properly when the next "moon set" occurs. Also importantly that you restrain yourself in a way that will enable you to get yourself out when your full human intelligence returns after you returned to your normal human form. Handily at the back of the book is a nice appendix that tells you every date those three moons will occur until December 2011. Not sure if the publishers will release an updated version for the years after but if not that appendix info will be a bit dated if your reading this review after 2011.

This book dispels the myths and wrongful assumptions that are out there about werewolves. If you've just been bitten you need to read this book. I had never even thought about how still wearing a wedding ring would mean the loss of a finger as the hand expanded cutting off circulation to the finger. Likewise don't make the restraints you are using to secure yourself so as not to wipe out innocent humans to tight for similar reasons. There's tons of information in this manual that you just probably have won't have thought of before it's too late.

There's also information on how to deal with fur chasers (those who want to be bitten by you), werewolf hunters (those who wish to kill you simply because you are a werewolf), where to buy your restraint system materials, where to build it, places you can secure yourself in an emergency, what to do if you got loose during your transformation and killed, the four types of werewolf bodies out there and basically how to live as normal a life as possible with the lycanthropy condition.

This is no boring book of rules or a you won't want to finish how to manual. It is quite entertaining and even if you haven't been bitten yourself quite informative on just learning about lycanthropy and the burdens your friends who may well be transforming into werewolves during every full moon have to deal with. Like learning first aid, this book is worth reading before you're bitten so on the off chance you are, you'll know what to do. Hopefully I'll never need this advice but it's good to know if I am I will know what to do.

21 of 28 people found the following review helpful.
Furthering your situation
By R. Howell
Similar in fashion to The Zen of Zombie and The Vampire Survival Guide, this handbook for the newly bitten werewolf shows you how to handle your transformations, new life, and cravings without hurting anyone. While the book on the whole was mildly entertaining and easy to read, all it really presents is a repetitive reminder on chaining yourself up in a saferoom for three nights a month (your moons). It covers concepts like your different stages you will encounter, longevity, how to feed, who to tell your secret, where to live, and avoiding doctors but always comes back around to securing yourself for those nights. You quickly grow tired of it. There's even mini-sidebars on real people that were purportedly werewolves, at least in the authors' presentation. I will say my teenage son read it after me and he laughed constantly. He's not a bookreader but he finished this in two days so it really interested him. The books not bad but it is far from great. Don't get me wrong, if you like these types of humor, tongue-in-cheek guidebooks, it is certainly worth adding to your collection.

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Minggu, 17 Oktober 2010

[L266.Ebook] Ebook Download The Puppy Place #30: Oscar, by Ellen Miles

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The Puppy Place #30: Oscar, by Ellen Miles

Welcome to the Puppy Place--where every puppy finds a home!

Charles and Lizzie Peterson love puppies. Their family fosters these young dogs, giving them love and proper care, until they can find the perfect forever home.

When Lizzie gets a phone call from Aunt Amanda about Oscar, a schnauzer, she wants to help. But this puppy has trouble getting along with other dogs. Will Lizzie be able to find this pup a friend?

  • Sales Rank: #335871 in Books
  • Published on: 2013-04-30
  • Released on: 2013-04-30
  • Original language: English
  • Number of items: 1
  • Dimensions: 7.75" h x 5.50" w x .25" l, .16 pounds
  • Binding: Paperback
  • 96 pages

About the Author
Ellen Miles loves dogs, which is why she has a great time writing Puppy Place books. And guess what? She loves cats, too! That's why she came up with a brand-new series called Kitty Corner. Ellen lives in Vermont and loves to be outdoors every day, walking, biking, skiing, or swimming, depending on the season. She also loves to read, cook, explore her beautiful state, play with dogs, and hang out with friends and family. Visit her web site at www.EllenMiles.net.

Most helpful customer reviews

1 of 1 people found the following review helpful.
It was perfect for me
By elizabeth saft
Its cute. My name is Lizzie and I happen to have a mini schnauzer named OSCAR. Might even consider checking out other books in the series that dont hit as close to home

1 of 1 people found the following review helpful.
These are wonderful books for children that love dogs!!
By Pat Maevers
My granddaughters love dogs and these are their very favorite books. We have everyone of them up to Oscar. I just hope the author will write lots more.

1 of 1 people found the following review helpful.
good
By Sharon Vanek
Little bit sad. A dog that is not friendly befriends a dog then the dog dyes it is really good

See all 11 customer reviews...

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Kamis, 14 Oktober 2010

[Y625.Ebook] Free Ebook How We Learn: The Surprising Truth About When, Where, and Why It Happens, by Benedict Carey

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How We Learn: The Surprising Truth About When, Where, and Why It Happens, by Benedict Carey

In the tradition of The Power of Habit and Thinking, Fast and Slow comes a practical, playful, and endlessly fascinating guide to what we really know about learning and memory today—and how we can apply it to our own lives.
 
From an early age, it is drilled into our heads: Restlessness, distraction, and ignorance are the enemies of success. We’re told that learning is all self-discipline, that we must confine ourselves to designated study areas, turn off the music, and maintain a strict ritual if we want to ace that test, memorize that presentation, or nail that piano recital.
 
But what if almost everything we were told about learning is wrong? And what if there was a way to achieve more with less effort?
 
In How We Learn, award-winning science reporter Benedict Carey sifts through decades of education research and landmark studies to uncover the truth about how our brains absorb and retain information. What he discovers is that, from the moment we are born, we are all learning quickly, efficiently, and automatically; but in our zeal to systematize the process we have ignored valuable, naturally enjoyable learning tools like forgetting, sleeping, and daydreaming. Is a dedicated desk in a quiet room really the best way to study? Can altering your routine improve your recall? Are there times when distraction is good? Is repetition necessary? Carey’s search for answers to these questions yields a wealth of strategies that make learning more a part of our everyday lives—and less of a chore.
 
By road testing many of the counterintuitive techniques described in this book, Carey shows how we can flex the neural muscles that make deep learning possible. Along the way he reveals why teachers should give final exams on the first day of class, why it’s wise to interleave subjects and concepts when learning any new skill, and when it’s smarter to stay up late prepping for that presentation than to rise early for one last cram session. And if this requires some suspension of disbelief, that’s because the research defies what we’ve been told, throughout our lives, about how best to learn.
 
The brain is not like a muscle, at least not in any straightforward sense. It is something else altogether, sensitive to mood, to timing, to circadian rhythms, as well as to location and environment. It doesn’t take orders well, to put it mildly. If the brain is a learning machine, then it is an eccentric one. In How We Learn, Benedict Carey shows us how to exploit its quirks to our advantage.
 
Praise for How We Learn

“This book is a revelation. I feel as if I’ve owned a brain for fifty-four years and only now discovered the operating manual.”—Mary Roach, bestselling author of Stiff and Gulp

“A welcome rejoinder to the faddish notion that learning is all about the hours put in.”—The New York Times Book Review
 
“A valuable, entertaining tool for educators, students and parents.”—Shelf Awareness
 
“How We Learn is more than a new approach to learning; it is a guide to making the most out of life. Who wouldn’t be interested in that?”—Scientific American
 
“I know of no other source that pulls together so much of what we know about the science of memory and couples it with practical, practicable advice.”—Daniel T. Willingham, professor of psychology at the University of Virginia


From the Hardcover edition.

  • Sales Rank: #36201 in eBooks
  • Published on: 2014-09-09
  • Released on: 2014-09-09
  • Format: Kindle eBook

Review
“This book is a revelation. I feel as if I’ve owned a brain for fifty-four years and only now discovered the operating manual. For two centuries, psychologists and neurologists have been quietly piecing together the mysteries of mind and memory as they relate to learning and knowing. Benedict Carey serves up their most fascinating, surprising, and valuable discoveries with clarity, wit, and heart. I wish I’d read this when I was seventeen.”—Mary Roach, bestselling author of Stiff and Gulp
 
“How We Learn makes for a welcome rejoinder to the faddish notion that learning is all about the hours put in. Learners, [Benedict] Carey reminds us, are not automatons.”—The New York Times Book Review
 
“The insights of How We Learn apply to far more than just academic situations. Anyone looking to learn a musical instrument would benefit from understanding what frequency and type of practice is most effective. Even readers with little practical use for Carey’s information will likely find much of it fascinating, such as how intuition can be a teachable skill, or that giving practice exams at the very beginning of a semester improves grades. How We Learn is a valuable, entertaining tool for educators, students and parents.”—Shelf Awareness

“How We Learn is more than a new approach to learning; it is a guide to making the most out of life. Who wouldn’t be interested in that?”—Scientific American
 
“Whether you struggle to remember a client’s name, aspire to learn a new language, or are a student battling to prepare for the next test, this book is a must. I know of no other source that pulls together so much of what we know about the science of memory and couples it with practical, practicable advice.”—Daniel T. Willingham, professor of psychology at the University of Virginia and author of Raising Readers in an Age of Distraction

“How We Learn is as fun to read as it is important, and as much about how to live as it is about how to learn. Benedict Carey’s skills as a writer, plus his willingness to mine his own history as a student, give the book a wonderful narrative quality that makes it all the more accessible—and all the more effective as a tutorial.”—Robert A. Bjork, Distinguished Research Professor, Department of Psychology, University of California, Los Angeles
 
“Fact #1: Your brain is a powerful and eccentric machine, capable of performing astonishing feats of memory and skill. Fact #2: Benedict Carey has written a book that will inspire and equip you to use your brain in a more effective way. Fact #3: You should use your brain—right now—to buy this book for yourself and for anyone who wants to learn faster and better.”—Daniel Coyle, bestselling author of The Talent Code

About the Author
Benedict Carey is an award-winning science reporter who has been at The New York Times since 2004, and one of the newspaper’s most emailed reporters. He graduated from the University of Colorado with a bachelor’s degree in math and from Northwestern University with a master’s in journalism, and has written about health and science for twenty-five years. He lives in New York City.

Excerpt. © Reprinted by permission. All rights reserved.
Chapter One

The Story Maker

The Biology of Memory

The science of learning is, at bottom, a study of the mental muscle doing the work—the living brain—and how it manages the streaming sights, sounds, and scents of daily life. That it does so at all is miracle enough. That it does so routinely is beyond extraordinary.

Think of the waves of information rushing in every waking moment, the hiss of the kettle, the flicker of movement in the hall, the twinge of back pain, the tang of smoke. Then add the demands of a typical layer of multitasking—say, preparing a meal while monitoring a preschooler, periodically returning work emails, and picking up the phone to catch up with a friend.

Insane.

The machine that can do all that at once is more than merely complex. It’s a cauldron of activity. It’s churning like a kicked beehive.

Consider several numbers. The average human brain contains 100 billion neurons, the cells that make up its gray matter. Most of these cells link to thousands of other neurons, forming a universe of intertwining networks that communicate in a ceaseless, silent electrical storm with a storage capacity, in digital terms, of a million gigabytes. That’s enough to hold three million TV shows. This biological machine hums along even when it’s “at rest,” staring blankly at the bird feeder or some island daydream, using about 90 percent of the energy it burns while doing a crossword puzzle. Parts of the brain are highly active during sleep, too.

The brain is a dark, mostly featureless planet, and it helps to have a map. A simple one will do, to start. The sketch below shows several areas that are central to learning: the entorhinal cortex, which acts as a kind of filter for incoming information; the hippocampus, where memory formation begins; and the neocortex, where conscious memories are stored once they’re flagged as keepers.

This diagram is more than a snapshot. It hints at how the brain operates. The brain has modules, specialized components that divide the labor. The entorhinal cortex does one thing, and the hippocampus does another. The right hemisphere performs different functions from the left one. There are dedicated sensory areas, too, processing what you see, hear, and feel. Each does its own job and together they generate a coherent whole, a continually updating record of past, present, and possible future.

In a way, the brain’s modules are like specialists in a movie production crew. The cinematographer is framing shots, zooming in tight, dropping back, stockpiling footage. The sound engineer is recording, fiddling with volume, filtering background noise. There are editors and writers, a graphics person, a prop stylist, a composer working to supply tone, feeling—the emotional content—as well as someone keeping the books, tracking invoices, the facts and figures. And there’s a director, deciding which pieces go where, braiding all these elements together to tell a story that holds up. Not just any story, of course, but the one that best explains the “material” pouring through the senses. The brain interprets scenes in the instants after they happen, inserting judgments, meaning, and context on the fly. It also reconstructs them later on—what exactly did the boss mean by that comment?—scrutinizing the original footage to see how and where it fits into the larger movie.

It’s a story of a life—our own private documentary—and the film “crew” serves as an animating metaphor for what’s happening behind the scenes. How a memory forms. How it’s retrieved. Why it seems to fade, change, or grow more lucid over time. And how we might manipulate each step, to make the details richer, more vivid, clearer.

Remember, the director of this documentary is not some film school graduate, or a Hollywood prince with an entourage. It’s you.

•••

Before wading into brain biology, I want to say a word about metaphors. They are imprecise, practically by definition. They obscure as much as they reveal. And they’re often self-serving, crafted to serve some pet purpose—in the way that the “chemical imbalance” theory of depression supports the use of antidepressant medication. (No one knows what causes depression or why the drugs have the effects they do.)

Fair enough, all around. Our film crew metaphor is a loose one, to be sure—but then so is scientists’ understanding of the biology of memory, to put it mildly. The best we can do is dramatize what matters most to learning, and the film crew does that just fine.

To see how, let’s track down a specific memory in our own brain.

Let’s make it an interesting one, too, not the capital of Ohio or a friend’s phone number or the name of the actor who played Frodo. No, let’s make it the first day of high school. Those tentative steps into the main hallway, the leering presence of the older kids, the gunmetal thump of slamming lockers. Everyone over age fourteen remembers some detail from that day, and usually an entire video clip.

That memory exists in the brain as a network of linked cells. Those cells activate—or “fire”—together, like a net of lights in a department store Christmas display. When the blue lights blink on, the image of a sleigh appears; when the reds come on, it’s a snowflake. In much the same way, our neural networks produce patterns that the brain reads as images, thoughts, and feelings.

The cells that link to form these networks are called neurons. A neuron is essentially a biological switch. It receives signals from one side and—when it “flips” or fires—sends a signal out the other, to the neurons to which it’s linked.

The neuron network that forms a specific memory is not a random collection. It includes many of the same cells that flared when a specific memory was first formed—when we first heard that gunmetal thump of lockers. It’s as if these cells are bound in collective witness of that experience. The connections between the cells, called synapses, thicken with repeated use, facilitating faster transmission of signals.

Intuitively, this makes some sense; many remembered experiences feel like mental reenactments. But not until 2008 did scientists capture memory formation and retrieval directly, in individual human brain cells. In an experiment, doctors at the University of California, Los Angeles, threaded filament-like electrodes deep into the brains of thirteen people with epilepsy who were awaiting surgery.

This is routine practice. Epilepsy is not well understood; the tiny hurricanes of electrical activity that cause seizures seem to come out of the blue. These squalls often originate in the same neighborhood of the brain for any one individual, yet the location varies from person to person. Surgeons can remove these small epicenters of activity but first they have to find them, by witnessing and recording a seizure. That’s what the electrodes are for, pinpointing location. And it takes time. Patients may lie in the hospital with electrode implants for days on end before a seizure strikes. The UCLA team took advantage of this waiting period to answer a fundamental question.

Each patient watched a series of five- to ten-second video clips of well-known shows like Seinfeld and The Simpsons, celebrities like Elvis, or familiar landmarks. After a short break, the researchers asked each person to freely recall as many of the videos as possible, calling them out as they came to mind. During the initial viewing of the videos, a computer had recorded the firing of about one hundred neurons. The firing pattern was different for each clip; some neurons fired furiously and others were quiet. When a patient later recalled one of the clips, say of Homer Simpson, the brain showed exactly the same pattern as it had originally, as if replaying the experience.

“It’s astounding to see this in a single trial; the phenomenon is strong, and we knew we were listening in the right place,” the senior author of the study, Itzhak Fried, a professor of neurosurgery at UCLA and Tel Aviv University, told me.

There the experiment ended, and it’s not clear what happened to the memory of those brief clips over time. If a person had seen hundreds of Simpsons episodes, then this five-second clip of Homer might not stand out for long. But it could. If some element of participating in the experiment was especially striking—for example, the sight of a man in a white coat fiddling with wires coming out of your exposed brain as Homer belly-laughed—then that memory could leap to mind easily, for life.

My first day of high school was in September 1974. I can still see the face of the teacher I approached in the hallway when the bell rang for the first class. I was lost, the hallway was swarmed, my head racing with the idea that I might be late, might miss something. I can still see streams of dusty morning light in that hallway, the ugly teal walls, an older kid at his locker, stashing a pack of Winstons. I swerved beside the teacher and said, “Excuse me” in a voice that was louder than I wanted. He stopped, looked down at my schedule: a kind face, wire-rimmed glasses, wispy red hair.

“You can follow me,” he said, with a half smile. “You’re in my class.”

Saved.

I have not thought about that for more than thirty-five years, and yet there it is. Not only does it come back but it does so in rich detail, and it keeps filling itself out the longer I inhabit the moment: here’s the sensation of my backpack slipping off my shoulder as I held out my schedule; now the hesitation in my step, not wanting to walk with a teacher. I trailed a few steps behind.

This kind of time travel is what scientists call episodic, or autobiographical memory, for obvious reasons. It has some of the same sensual texture as the original experience, the same narrative structure. Not so with the capital of Ohio, or a friend’s phone number: We don’t remember exactly when or where we learned those things. Those are what researchers call semantic memories, embedded not in narrative scenes but in a web of associations. The capital of Ohio, Columbus, may bring to mind images from a visit there, the face of a friend who moved to Ohio, or the grade school riddle, “What’s round on both sides and high in the middle?” This network is factual, not scenic. Yet it, too, “fills in” as the brain retrieves “Columbus” from memory.

In a universe full of wonders, this has to be on the short list: Some molecular bookmark keeps those neuron networks available for life and gives us nothing less than our history, our identity.

Scientists do not yet know how such a bookmark could work. It’s nothing like a digital link on a computer screen. Neural networks are continually in flux, and the one that formed back in 1974 is far different from the one I have now. I’ve lost some detail and color, and I have undoubtedly done a little editing in retrospect, maybe a lot.

It’s like writing about a terrifying summer camp adventure in eighth grade, the morning after it happened, and then writing about it again, six years later, in college. The second essay is much different. You have changed, so has your brain, and the biology of this change is shrouded in mystery and colored by personal experience. Still, the scene itself—the plot—is fundamentally intact, and researchers do have an idea of where that memory must live and why. It’s strangely reassuring, too. If that first day of high school feels like it’s right there on the top of your head, it’s a nice coincidence of language. Because, in a sense, that’s exactly where it is.

•••

For much of the twentieth century scientists believed that memories were diffuse, distributed through the areas of the brain that support thinking, like pulp in an orange. Any two neurons look more or less the same, for one thing; and they either fire or they don’t. No single brain area looked essential for memory formation.

Scientists had known since the nineteenth century that some skills, like language, are concentrated in specific brain regions. Yet those seemed to be exceptions. In the 1940s, the neuroscientist Karl Lashley showed that rats that learned to navigate a maze were largely unfazed when given surgical injuries in a variety of brain areas. If there was some single memory center, then at least one of those incisions should have caused severe deficits. Lashley concluded that virtually any area of the thinking brain was capable of supporting memory; if one area was injured, another could pick up the slack.

In the 1950s, however, this theory began to fall apart. Brain scientists began to discover, first, that developing nerve cells—baby neurons, so to speak—are coded to congregate in specific locations in the brain, as if preassigned a job. “You’re a visual cell, go to the back of the brain.” “You, over there, you’re a motor neuron, go straight to the motor area.” This discovery undermined the “interchangeable parts” hypothesis.

The knockout punch fell when an English psychologist named Brenda Milner met a Hartford, Connecticut, man named Henry Molaison. Molaison was a tinkerer and machine repairman who had trouble keeping a job because he suffered devastating seizures, as many as two or three a day, which came with little warning and often knocked him down, out cold. Life had become impossible to manage, a daily minefield. In 1953, at the age of twenty-seven, he arrived at the office of William Beecher Scoville, a neurosurgeon at Hartford Hospital, hoping for relief.

Molaison probably had a form of epilepsy, but he did not do well on antiseizure drugs, the only standard treatment available at the time. Scoville, a well-known and highly skilled surgeon, suspected that whatever their cause the seizures originated in the medial temporal lobes. Each of these lobes—there’s one in each hemisphere, mirroring one another, like the core of a split apple—contains a structure called the hippocampus, which was implicated in many seizure disorders.

Scoville decided that the best option was to surgically remove from Molaison’s brain two finger-shaped slivers of tissue, each including the hippocampus. It was a gamble; it was also an era when many doctors, Scoville prominent among them, considered brain surgery a promising treatment for a wide variety of mental disorders, including schizophrenia and severe depression. And sure enough, postop, Molaison had far fewer seizures.

He also lost his ability to form new memories.

Every time he had breakfast, every time he met a friend, every time he walked the dog in the park, it was as if he was doing so for the first time. He still had some memories from before the surgery, of his parents, his childhood home, of hikes in the woods as a kid. He had excellent short-term memory, the ability to keep a phone number or name in mind for thirty seconds or so by rehearsing it, and he could make small talk. He was as alert and sensitive as any other young man, despite his loss. Yet he could not hold a job and lived, more so than any mystic, in the moment.


From the Hardcover edition.

Most helpful customer reviews

194 of 197 people found the following review helpful.
Deserves a Wide Reading
By Evelyn Uyemura
I keep up fairly well with research in the field of psychology and learning in particular, so much of this information was not entirely new and surprising to me, but Benedict Carey does a great job of pulling a lot of different research together and presenting it a practical way. This is more a guide to what is known than a self-help book, but it will definitely be of use both to teachers and students who want to understand how to study more effectively.

A couple of take-aways--half-forgetting and then re-learning, especially by trying to remember, make the thing you are trying to learn really stick. So as a teacher, when I start class on Monday and ask students to recall what it was we were working on last Friday, that is not just review--that is learning. It would be best, I suppose, if instead of asking the whole class and letting one or two students do the hard work, I had everyone try their best to write down what the remember about passive voice or the subjunctive.

That brings up another great point that he makes--that testing, quizzing, and self-testing are highly effective ways not of evaluating but of actually learning. This helps to overcome what he calls the Fluency Illusion, and what I have long called the "smile-and-nod" level of understanding. IN other words, when the teacher is doing math problems on the board and you are watching, you understand--you smile and nod and think, ok, yeah, sure, I get it. It is only when the tables are turned and the teacher says, Ok, now you try it, that the gaps in understanding are revealed.

So if you are studying for a test on state capitals, let's say, and you see Georgia: Atlanta, you think right, sure. But it's not until someone says Georgia and you can say Atlanta that you actually know it. And each time you test yourself, or have someone else test you, you are retrieving and then re-storing that memory, making it more salient. I would go so far as to suggest that one difference between middle-class kids and poor kids in school is that middle-class parents often quiz their kids on their school-work. "Let's go over those state capitals together," and less-educated parents probably don't. That could be enough to make a big difference, since this is such a powerful learning tool.

He also reports on interesting work on how location and distraction can help rather than hurt our learning--studying in a variety of places, with varying amounts of distraction can help us remember more. And spaced practice works better than intense practice. IN other words, if you have one hour to learn the capitals of all the countries in Europe, or the parts of the hand, it would be better to do 3 20-minute sessions, especially if you sleep between at least two of the sessions, than to do all 60 minutes at once. And what about cramming? We don't really need research to tell us this, but yes, it works if your only goal is to pass the test, but if you actually want to learn the material, it is worthless. You forget it as fast as you "learned" it.

One great point to this book is that he covers widely diverse fields of study--from physical skills like a golf swing or a tennis serve, to complex skills like flying a plane, to rote memorization, such as vocabulary or state capitals., to comprehension of difficult concepts like economics or physics. Many of the techniques he describes apply across the board, and others are more particular to certain types of learning. For example, for physical performance (a piano recital or a baseball tryout, you do better if you sleep in a bit, getting plenty of the kind of sleep that occurs towards morning. For memory like a vocabulary test, it's better to get plenty of the early-stage sleep, so go to bed on time and get up early in the morning to review. Your brain does a lot of memory consolidation while you sleep, and specific types in specific stages.

One point that he doesn't directly address but that I am familiar with the research on is whether it's better to memorize large things as a whole or in chunks. For example, if you are an actor, or you want to memorize a long poem or speech, should you work on the first sentence, and then the second sentence, and so on, or should you go through the whole thing each time. The answer is that you should do it whole--it will feel like you're not getting anywhere at first, but suddenly, the whole thing will be in there This fits with what he says about inter-leaving---practicing a variety of different things in each session rather than chunking it all together--master skill A before moving on to skill B. No, it's better to do some A, some B, and some C, even though it will feel like you aren't making progress at first.

I recommend this book to every teacher of any subject, and to anyone who is a student at any level, and to parents, who worry that their kids are too distracted and unfocused in the way they study--turns out that distraction and lack of focus can serve you well!

124 of 126 people found the following review helpful.
An enjoyable read, very effective!
By iWin
Benedict Carey's "How We Learn" is focused on the process of enhancing and exercising our memories in order to achieve positive results in memorization. He goes in depth in helping his readers enhance their memories through several techniques, in order to register, store and retrieve information. Most of us are not aware that our brains are capable of so much, but Benedict Carey makes the process look easy. Some of his techniques range from beginners techniques, to more advanced. I pretty much have the beginners techniques down pact; I would like to divulge into the more advanced techniques, as enhancing my memory has become a number one priority in my life.

Repetition, according to Benedict, is a vital part in helping us to enhance the memory. We must train our brains, in a way, so that certain things we may forget become more and more routine to us. For example, I sometimes forget to lock all the doors in my house before going to sleep. If I am aware of this and practice locking the doors each and every night, soon enough it will become routine to me and I'll no longer forget to do it.

I read this book, in conjunction with Greg Frosts book, "Maximizing Brain Control : Unleash The Genius In You", and I'm starting to feel more confident and knowledgeable in learning about the human brain and how to store and retrieve information. Both are excellent resources and combined, can truly work wonders for you if you take them serious and truly want to enhance your brain capacity.

Good Habits is a key technique both books teach. If you can associate certain things with something you are more familiar with, you are more likely to start remembering as time goes on. Problem Solving is a third technique in which Benedict explains. If you can train your brain to solve the problem that need to be completed, we also learn the upside of distraction.

He also provides dietary advice that can help to improve our memory. Most of us would not think or believe that sleep actually plays a vital role in our brain function and memorization, but it does. Something as simple as making small changes in our lifestyle can actually enhance our memories.

92 of 97 people found the following review helpful.
How to be a better learner seems to be a big trend in recent ...
By B.L.
There's plenty of information here to work with. How to be a better learner seems to be a big trend in recent books. In the past couple of months I've read Fluent Forever (about language learning) and A Mind For Numbers (about being a good student, particularly in math and science) and they've all been released at the same time. They're also all, I'm very happy to say, strongly grounded in real research, rather than just making up some interesting-sounding notions about what might work (I have certainly seen books that did that...)

I would have to say that someone who wants to be a great student ASAP is probably better off reading A Mind For Numbers first. That book takes you by the hand and leads you through the ideas about what you need to DO a lot more specifically. It makes very frequent references to research, but it's plainly written with the intention of being a guide for people who are taking and really need to hone in on exactly what to do NOW, because there are tests coming up. It leads you through the material by the hand, pretty much, asking you questions and reminding you to stop and think about what you've read. It also has a (free) online MOOC through Coursera to go with it that covers/reinforces the same material.

Fluent Forever, in its effort to teach people how to learn languages, makes use of some of the same research, but shapes it to its topic. It offers a sort of general idea of how you should proceed, but the emphasis is on giving you a basic plan and just enough understanding of the research so that you can make good decisions about how to move forward with it.

I feel like How We Learn is a little farther down the spectrum in that same direction. Most of its emphasis is on teaching you the research (some of which is the same research cited by the other two), with an assumption that you'll be able to make reasonable decisions about how to put it into practice. So he goes over exactly why it is NOT a good idea to learn a new math trick by doing 50 problems in a row that use that trick. He touches on how it can be put into practice, but it isn't something he dwells on. This vs A Mind for Numbers is sort of like... one being a professor who teaches key points but assumes that the students are capable of drawing some reasonable conclusions on their own, and the other being a professor who strives to touch on every single possible issue that might be of importance. It's a very different style.

For someone who's actually writing a paper on learning or something of that nature, I suspect this will be more valuable. For someone who is actively taking classes or trying to learn a language, I'd say read either A Mind for Numbers or Fluent Forever first, because they'll get you going on making progress faster. Then, it certainly wouldn't hurt to come back to review some of the concepts and generally deepen your understanding overall by reading How We Learn. (If you're not taking classes and you just love teaching yourself new things, you might want to skip A Mind for Numbers. It puts a lot of emphasis on things like dealing with procrastination, which is very valuable, but not really a core issue if you're learning for pleasure and there aren't really any deadlines to speak of.)

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Pterosaurs: Natural History, Evolution, Anatomy, by Mark P. Witton

For 150 million years, the skies didn't belong to birds--they belonged to the pterosaurs. These flying reptiles, which include the pterodactyls, shared the world with the nonavian dinosaurs until their extinction 65 million years ago. Some pterosaurs, such as the giant azhdarchids, were the largest flying animals of all time, with wingspans exceeding thirty feet and standing heights comparable to modern giraffes. This richly illustrated book takes an unprecedented look at these astonishing creatures, presenting the latest findings on their anatomy, ecology, and extinction.

Pterosaurs features some 200 stunning illustrations, including original paintings by Mark Witton and photos of rarely seen fossils. After decades of mystery, paleontologists have finally begun to understand how pterosaurs are related to other reptiles, how they functioned as living animals, and, despite dwarfing all other flying animals, how they managed to become airborne. Here you can explore the fossil evidence of pterosaur behavior and ecology, learn about the skeletal and soft-tissue anatomy of pterosaurs, and consider the newest theories about their cryptic origins. This one-of-a-kind book covers the discovery history, paleobiogeography, anatomy, and behaviors of more than 130 species of pterosaur, and also discusses their demise at the end of the Mesozoic.


  • The most comprehensive book on pterosaurs ever published

  • Features some 200 illustrations, including original paintings by the author

  • Covers every known species and major group of pterosaurs

  • Describes pterosaur anatomy, ecology, behaviors, diversity, and more

  • Encourages further study with 500 references to primary pterosaur literature

  • Sales Rank: #296557 in Books
  • Published on: 2013-06-23
  • Original language: English
  • Number of items: 1
  • Dimensions: 11.25" h x 9.00" w x 1.25" l, 3.29 pounds
  • Binding: Hardcover
  • 304 pages

Review
"A comprehensive introduction. . . . Witton manages to make this an attractive book for the layperson and bring these flying fossils to life."--Natural History

"Witton's new tribute to pterosaurs gives these fantastic fossil creatures a much-needed makeover in two crucial ways. Not only does the book bring the science of pterosaurs up to date--at long last following-up other classics such as David Unwin's The Pterosaurs and Peter Wellenhofer's Illustrated Encyclopedia of Pterosaurs--but Witton is a highly-skilled and imaginative artist who ably reconstructs the bones of the animals and brings them back to life in startling poses. Witton's pterosaurs are fantastical creatures deserving their own time in the spotlight. . . . Witton's combination of style and substance makes Pterosaurs a true treasure and an absolute must for anyone curious about the extinct flyers."--Brian Switek, National Geographic.com

"This really is the ultimate guide to pterosaurs, providing us with a richer view of pterosaur diversity and behaviour than allowed in the two previous great volumes on the group (Wellnhofer 1991, Unwin 2005) and containing a substantial amount of review and analysis of pterosaur ecology and functional morphology."--Darren Naish, Scientific American

"A solid review of the whole of the Pterosauria that'll be genuinely useful for researchers for many years. I'm sure I'll be typing 'Witton, (2013) stated . . .' quite a lot in the future and that, if anything, should be a good measure of how I rate this as a scientific text. Now go buy a copy and read it, it really is very good."--Dave Hone, Pterosaur.Net

"[Witton] presents the uncertainties of science but never shies away from making his opinion clear. [He] respects the complexities [of scientific writing] without allowing them to clump up the text. . . . I can wholeheartedly recommend the book already."--David Mass, DRIP

"Pterosaurs would make an excellent addition to any reference collection and especially that of an advanced (adult or young adult) lay-reader."--Greg Leitich Smith, GSL Blog

"I can tell you that it is not only a fascinating bit of text, its illustrations will leave you gaping in awestruck amazement."--John E. Riutta, Well-read Naturalist

"[Witton] combines his deep knowledge of the subject as a palaeontologist at the University of Portsmouth (U.K.) with his skills as an artist, and he has a flair for informal but accurate writing. His 292-page book is the most comprehensive and authoritative book to come along since Peter Wellnhofer's classic Illustrated Encyclopedia of Pterosaurs back in 1991."--James Gurney, artist and author of the Dinotopia book series

"The joy of Pterosaurs is how it brings long extinct animals to life."--Jeff Hecht, New Scientist

"Learn all about flying reptiles in this artfully illustrated overview of pterosaur research."--Science News

"Highly recommended."--EverythingDinosaur.com

"Once dragons flew through Mesozoic skies! They were pterosaurs, and Witton offers a rich and extensive account of what science knows about these extinct creatures. . . . For those who want an introduction to flying reptiles or the craft of scientific research, this title is a great choice."--Eileen H. Kramer, Library Journal

"Beautifully laid out, clearly written, loaded with handsome illustrations, Witton's book invites you to dip in for delicious tidbits or hunker down for the equivalent of a superb lecture series."--Wilson's Bookmarks, Christianity Today

"This is a book of impeccable scholarship, but it is also very readable for the non-scholar and amateur pterosaurophile. . . . A wonderful book!"--Rabbi Dr Charles H Middleburgh, Middleburgh Blog

"Though the writing style clearly targets the book to nonexperts, it does not dilute its realized value for professional paleontologists or teachers of paleontology. This is a very skillful presentation: a brief introductory paragraph or two leads quickly into an advanced discussion. The illustrations are excellent, including nice reconstructions by the author and very high-quality photographic reproductions of original key fossils. Overall, this is a very well-done book that belongs in any library with a vertebrate paleontology collection."--Choice

"Although the text is mostly technical, directed at an informed audience, it is written with a humorous slant. Everyone will get something out of reading this book. . . . This is a fantastic book!"--Randy Lauff, Canadian Field Naturalist

"Witton's Pterosaurs is a remarkable visual feast, packed full of novel art as well as excellent photographs that the author clearly worked hard to obtain. There are, in fact, illustrations of some sort on virtually every single page--you will never get bored of looking at this book. . . . If you like or are even vaguely interested in pterosaurs, you really need this book."--Darren Naish, Historical Biology

From the Back Cover

"This book is both academically interesting and truly fun to read. That is a difficult balance to reach, but Witton does an excellent job of it by using a lighthearted, informal writing style in combination with a well-referenced, serious scientific review. An invaluable reference."--Michael Habib, University of Southern California

About the Author
Mark P. Witton is a paleontologist in the School of Earth and Environmental Sciences at the University of Portsmouth. He has served as a technical consultant for "Walking with Dinosaurs 3D" and many other film and television productions. His illustrations of pterosaurs, dinosaurs, and other prehistoric creatures have appeared in numerous publications, including "Science" and newspapers around the world.

Most helpful customer reviews

17 of 19 people found the following review helpful.
One more excellent book on pterosaurs
By eagseags
Pterosaurs, flying reptiles from the Mesozoic, have always taken a back seat to dinosaurs in terms of popular books. I own three books on pterosaurs:
“The Illustrated Encyclopedia of Pterosaurs” by Peter Wellnhofer from 1991.
“The Pterosaurs: From Deep Time” by David Unwin from 2005.
"Pterosaurs" by Mark Witton from 2013.

These are all excellent books. The last is the subject of today's review. You should not confuse the Witton book "Pterosaurs" with a book from 2012 "Pterosaurs: Flying Contemporaries of the Dinosaurs," of which Witton is one of three coauthors.

By the way, the first popular book on pterosaurs "Dragons of the Air" (1901) by H.E. Seeley is available as a free e-book at [...]

Witton is at the School of Earth and Environmental Sciences at the University of Portsmith. He is a freelance artist as well as a paleontologist and has a blog at [...] .

I will start with a little background on pterosaurs, which will make further discussions more understandable. Pterosaurs are the first vertebrates that learned powered flight. Compared to most vertebrates, pterosaurs tend to have extremely large heads and extremely small legs relative to their torsos. Many pterosaurs had a large ridge of bone above their dorsal vertebrae called the notarium, to which the scapula sometimes articulated. Bird wings are made of feathers attached to their (relatively short arms). Bat wings are made from skin stretched between the body and between five elongated fingers. Pterosaur wings were made from skin stretched from the body to an enormously elongated fourth finger, which is unique among vertebrates. There are enough fossils preserving the soft tissue of pterosaur wings, which is typically a few millimeters thick, that we can tell the wings contained, starting from the ventral side, a layer of blood vessels, a layer of muscle, and a layer of semi-rigid fibers. The wings and body of pterosaurs probably had some kind of fur or protofeathers, it is hard to tell which. All pterosaurs had a unique splint-like bone at the wrist called the pteroid, probably used to change the shape of the leading edge of the wing.

Despite having a very different wing structure, pterosaurs are convergent with birds on may features. They had bones with very thin walls (presumably for lightness). They had very rigidified ribcages, and there is evidence in the bones for air sacs. Presumably these features could have allowed for an efficient one-way respiration system as in birds. Their brains tended to be large and globular, like a bird’s, and not elongated like a typical reptile’s. All these point to a life as agile fliers requiring large amounts of energy. (Forget the antiquated idea of pterosaurs as gliders needing to jump off high cliffs to fly.)

Classically pterosaurs are divided into two types: rhamphorhynchoids (named for Rhamphorhynchus) and pterodactyloids (named for Pterodactylus). Rhamphorhynchoids lived from the Late Triassic until the Early Cretaceous. They generally were small and had large toothed heads on a short neck. They also had long tails with a rhomboid shaped vane at the end. Pterodactyloids lived from the Middle Jurassic until the Late Cretaceous. The had large heads on long necks, but no tails. Many of them were toothless.

The fact that pterosaur bones are hollow means that most fossils end up looking like “roadkill,” and the fine anatomical details, such as the shape of the joints, is usually erased.

Aspects of pterosaurs that were mysteries for 100 years are not so much of a mystery since about a decade ago. There are enough well-preserved specimens (e.g. from China) that we know where the wing membrane attached to the body. We have enough pterosaur trackways that we have a good idea of how they handled themselves on land: as quadrupeds walking with their legs underneath, walking on wrist pads and the sole of the foot. There are now several known pterosaur eggs, and we know pterosaur babies probably could fly as soon as they hatched. What remains a mystery is which branch of archosaurs the pterosaurs arose from. Also we do not know a specific animal that could be the "protopterosaur" ancestor, that could perhaps climb trees and glide in the style of a flying squirrel, but not fly.

Witton's "Pterosaurs" has 26 chapters, the first 8 deal with general findings on pterosaurs, their anatomy, how they flew, how they got along on the ground, how they reproduced, etc. This is very similar to what you find in Unwin's book. One interesting perspective from Witton is about the idea of "weight reduction." The classical idea is that pterosaurs acquired hollow bones and air sacs to make them lighter and more airworthy. Witton reverses this and says the idea is to take animals of a constant weight and make them larger (e.g. more surface area for flight). I'm not sure one can really distinguish the two in practice, but it is thought-provoking. Another idea presented by Witton is that the masses of pterosaurs are underestimated by most workers in the field, such that the mass per wing area is much smaller than that of living birds. If we allow for larger masses in pterosaurs, we can allow for more powerful muscles, which are needed for flight.

The real uniqueness of Witton's "Pterosaurs," compared to Unwin's book, is in the15 chapters on individual pterosaur subgroups. (There is a small irony here because the taxonomy is based on Unwin's system.) Each group is presented in detail: a discussion of each genus, unique features, the probable lifestyle, etc. Literature references are included. These chapters can be a little tough to get through in spots, since they are something like a professional review article, but that makes this book useful for professionals as well as interested amateurs like us. The first thing you learn is that pterosaur group names are pretty hard to remember (Anurognathidae, Wukongopteridae, Ctenochasmotoidae, etc.) But the important thing is that if you look within each group there is a tremendous diversity: longer vs. shorter heads, teeth vs. no teeth, crests vs. crests, larger vs. smaller legs and feet, long wings vs. short, claws on the hand vs. no claws, etc. Thus, pterosaurs were probably as diverse in anatomy and lifestyle as birds are now. Witton points out that the classical division into rhamphorhynchoids and pterodactyloids might not be useful in the sense that while pterodactyloids are probably a monophyletic group, the rhamphorhynchoids are probably a collection of primitive types, that might not be closely related to each other. Also, while we are pretty sure more groups of pterosaur are not likely to be identified, we know hardly anything about some groups like the Lonchodectidae because their remains are just so fragmentary.

Pterosaurs can have some really bizarre anatomy. For my money, the most bizarre snout belongs to Pterodaustro (from South America). Both its mandible and maxilla are upturned. The lower jaw has hundreds of extremely elongated teeth arranged in a comb-like formation. One can only imagine Pterodaustro using this apparatus to filter feed like a flamingo. The most bizarre crest is found in Nyctosaurus (from Kansas). The crest branches into two cylindrical spars, one pointing up and one pointing back. The crest is about three times as long as the skull and about 20% longer than the head, body, and legs combined. You look at this animal and your first thought is "No way that can be real." However, there are two specimens with the crest intact, so there is no doubt.

Speaking of crests, my impression from "Pterosaurs" is that the proportion of pterosaurs with crests is higher than anyone suspected before. While the crests of many pterosaurs are bony, or partly bony, some crests consist only of soft tissue. We see more of the latter now because we have more specimens with preserved soft tissue and/or we now know to look for soft tissue in fossils with ultraviolet light. The original Pterodactylus from Solnhofen, for instance, one of the first pterosaurs known, has a soft tissue crest along its entire snout. While a number of authors have suggested crests could have some aerodynamic or thermal function, it is most likely they were for sexual display since closely related species have different crests.

Pterosaurs attained a size range that birds never came close to matching. Quetzalcoatlus (from Texas) is usually depicted as the largest known pterosaur in popular books, but Quetzalcoatlus belongs to a family of extremely large pterosaurs, the Azhdarchidae. The largest known is Hazegopteryx. It probably stood as tall as a giraffe, had wingspan of about 11 meters, and had the longest skull (3 meters) of any non-marine tetrapod. It is interesting that there are many large flightless birds, but as far as we know, there are no secondarily-flightless pterosaurs, even among the largest ones.

The writing style of "Pterosaurs" is pretty informal, despite the "review article" format, sometimes verging on "cuteness." I don't mean this in a bad way. I was amused by section headings such as "In the Absence of Proper Data, Speculate Wildly" and figure captions such as "Tupandactulus imperator doing his best Clint Eastwood impression on the scrubby hinterland of the Aptian Crato lagoon."

"Pterosaurs" has the expected photographs of fossil specimens and some very clear diagrams, plus world maps showing where key pterosaurs fossils are found. The pictures that depict living pterosaurs are of two types: the pterosaur in a standard "takeoff" pose, such that different genera can be compared, and the pterosaur in "real life" situations, flying, fighting, eating, etc. All of the restorations are watercolors done by the author. I enjoyed them and they get the point across, but they struck me as more "artistic" than "scientific", compared to comparable illustrations by, say, John Gurche.

This book is well worth reading and is available at a reasonable price.

19 of 22 people found the following review helpful.
Pterosaurs: Natural History, Evolution, Anatomy
By P. Nicholson
A great source book from someone who seems to eat, drink and sleep Pterosaurs. Witton covers everything imaginable from theories of what the forebears of pterosaurs might have been, up through a detailed examination of the amazing structure underlying what appear to be simple leather wings and the probable ecological niches each species inhabited and adapted to... to how they walked on the ground and launched themselves into the air. All with great illustrations. Highly recommended.

8 of 8 people found the following review helpful.
A feast of the first vertebrate experiment with flight--ornithologists take note!
By Richard D. Norris
Before reading this book I knew almost nothing about pterosaurs but now I see them for the amazing, ecologically diverse creatures they were--an experiment with vertebrate flight that produced all sorts of interesting parallels with birds. I'm a professional paleontologist, so for me the discussion of bones and taxonomy is no barrier. But like many readers, I expect, the most interesting parts of this lovely book lie in the discussions of paleoecology, the controversies in `pterosaurology' and the fuzzy, still emerging vision of an alternate world of flying animals. Witton is a good writer--witty, a bit informal, and an expert with a skill at telling a story well. For me, it is a perfect combination of wit and fact; I can gloss over the bone names and inside-controversy if I want to glean the meat of how the animals worked and what their world was like. His descriptions of these animals as living things are not particularly technical and should be accessible to an general reader. People who know something about birds will likely particularly enjoy this book. But, increasingly as I read each chapter while brushing my teeth or sitting on the pot, I have taken to absorbing it all. Indeed, I have taken to comparing this book very favorably to other works of this kind, such as Long's "The Rise of Fishes" (much more taxonomic than it should be) and similar books that survey major groups. Three cheers for Mark Witton!

Witton is also a good illustrator, and has put flesh, color, and speculative reality on his pterosaurs. The book is illustrated with lots of paintings, some of which are a bit more artistic than fully informative, but which give you a sense (in an `informed-speculation' way) of what these animals were like as living things. He also has lovely photographs of the actual specimens and anatomical drawings of the skeletons and other features of each group of pterosaurs. It is handy to have the photographs in this book since they help me appreciate how scrappy a lot of the fossil material actually is. That realization, in turn, tempers one's acceptance of the fully fleshed-out paintings and skeletal drawings.

Still, there is enough there (amazingly, for such delicate creatures) that we gain a sense for just how diverse and incredible pterosaurs were as a group. There were flamingo-like pterosaurs, nightjar-like pterosaurs, and albatross-like pterosaurs. There were pterosaurs with huge, likely brightly colored crests, and ones with scimitar-wings and broad-rounded wings. The emerging image is of a group with huge diversity that has explored many of the same alleyways as birds. At the same time, pterosaurs were also not just an early try at being birds, since they seem to have many unique features of their ecology. Pterosaurs went in for a huge variety of head crests--massive, elaborate affairs that provided an alternative way to impress mates compared to peacock's tails. Their mouths were crammed with baskets of teeth--a distinctly un-bird-like approach to life. Further, many pterosaurs had dinky tails that seemingly must have given them oddly unbalanced bodies considering their long necks and big heads. Just how did these animals fly without nose-diving into the ground? It is unfortunate that we have just a few scraps of them in the fossil record, but what a record it is turning out to be! Glorious diversity, most wonderful!

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