Danger-junkie orangutans(猩猩) in Borneo climb dead trees and shake then until they begin to fall. They scream with excitement as they cling to the falling tree. Just before the tree hits the ground the orangutans leap to another tree or vine, narrowly escaping death. While no one cab ask orangutans if they enjoy it as a person playing an extreme sport, one animal behaviorist sees this monkey fun as a bit of harmless thrill-seeking.

    A growing number of scientists agree that animals are conscious and capable of experiencing basic emotions(情感), such as happiness, sadness, boredom or depression. A few scientists even see the possibility for higher animal emotions like love, jealousy and spite.

    Five years ago, behaviorist and animal-rights activist Dr. Jonathan Balcombe stood on a Virginia hotel balcony watching two crows intimately groom (清洁) each other in the comfort of an abandoned billboard. He felt that the birds liked what they were doing, even if engaged in a natural, beneficial act, such as picking parasites (寄生虫) off the other's feathers. That moment changed the way he would view animals forever and led to a book, “Pleasurable Kingdom: Animals and the Nature of Feeling Good”, which is filled with hundreds of examples of animals living it up thanks to developed senses of touch, taste, sight, sound and smell.

    Balcombe recounts a favorite example of Kenyan hippos (河马) having high-end spa treatment in a fresh water spring. They splay their toes, open their mouths wide and wait for a school of cleaner fish to remove parasites and slough off dead skin, he recalls. Balcombe knows that the hippos and the fish both benefit from this arrangement. “My interpretation is that it is also enjoyable for them ,” he says.

    Tonight, my piano concert was the most important thing in my family. My grandparents were coming by plane to hear me play. Even my busy Aunt Dianne who is on TV every night reading the news, was coming.

    But one thing was for sure. I would never win an award for my piano playing. And that's just because the more I practiced ,the more nervous I got. So there I was, on stage, in my beautiful dress, and I sat down at the piano. But when I started to play, I hit a wrong note. I told myself to start over. But then I hit the wrong note again. It was as if I hadn't practiced at all.

    Finally the disaster was over. I ran off the stage. I couldn't understand why people were applauding. But they were. My mom and my dad had flowers for me, and we were all supposed to go out for a nice dinner, but I couldn't. I just wanted to go home and cry and never go anywhere again. After we went back home, Aunt Dianne just came in and sat down on the side of my bed.

    "It was my first night on the air," she said."I had never been on television before, and I made a mistake. I mispronounced my name and the name of the news show. And you know what? No one even noticed but me. Just like tonight, no one noticed—just you". Aunt Dianne was right. I think we are harder on ourselves than anyone else is. Maybe I will leave my room. And maybe, I'll play the piano again.

    If a diver surfaces too quickly, he may suffer the bends. Nitrogen(氮) dissolved(溶解) in his blood is suddenly liberated by the reduction of pressure. The consequence, if the bubbles (气泡)accumulate in a joint, is sharp pain and a bent body—thus the name. If the bubbles form in his lungs or his brain, the consequence can be death.

    Other air-breathing animals also suffer this decompression(减压) sickness if they surface too fast: whales, for example. And so, long ago, did ichthyosaurs. That these ancient sea animals got the bends can be seen from their bones. If bubbles of nitrogen form inside the bone they can cut off its blood supply. This kills the cells in the bone, and consequently weakens it, sometimes to the point of collapse. Fossil (化石)bones that have caved in on themselves are thus a sign that the animal once had the bends.

    Bruce Rothschild of the University of Kansas knew all this when he began a study of ichthyosaur bones to find out how widespread the problem was in the past. What he particularly wanted to investigate was how ichthyosaurs adapted to the problem of decompression over the 150 million years. To this end, he and his colleagues traveled the world's natural-history museums, looking at hundreds of ichthyosaurs from the Triassic period and from the later Jurassic and Cretaceous periods.

    When he started, he assumed that signs of the bends would be rarer in younger fossils, reflecting their gradual evolution of measures to deal with decompression. Instead, he was astonished to discover the opposite. More than 15% of Jurassic and Cretaceous ichthyosaurs had suffered the bends before they died, but not a single Triassic specimen(标本) showed evidence of that sort of injury.

    If ichthyosaurs did evolve an anti-decompression means, they clearly did so quickly—and, most strangely, they lost it afterwards. But that is not what Dr Rothschild thinks happened. He suspects it was evolution in other animals that caused the change.

    Whales that suffer the bends often do so because they have surfaced to escape a predator (捕食动物) such as a large shark. One of the features of Jurassic oceans was an abundance of large sharks and crocodiles, both of which were fond of ichthyosaur lunches. Triassic oceans, by contrast, were mercifully shark- and crocodile-free. In the Triassic, then, ichthyosaurs were top of the food chain. In the Jurassic and Cretaceous, they were prey(猎物) as well as predator—and often had to make a speedy exit as a result.

    The morning of March 2, 2012, was a busy one for the students in Mrs. Goodknight's class in Henryville, Indiana. There was morning meeting with poems to read, jokes to share, and tests to prepare for. "It was just an ordinary day," says student Lyric Darling, 12.

    At noon, while students played basketball under a sunny sky, a huge tornado (龙卷风) was forming 50 miles away. Around 2:25 p.m. 20 minutes before school was supposed to let out, a huge tornado touched down in Fredericksburg, 20 miles away. As word spread, parents rushed to the school. Teachers rushed to get kids onto buses or into waiting cars. By 2:45, the skies were darkening.

    "I was crying," says Lyric. "All around me, kids were crying." Two buses returned to the school with students whose parents had not been home. Teachers brought the kids to the office, where they all took cover under desks. Suddenly the power went out. And then the tornado attacked the school, filled with wood and trees and glass. The tornado was over the school for less than one minute. In that time, it almost completely destroyed the school. Teachers were about to lead the group out of the office when a second tornado was upon them. When it finally ended, the group made its way out of the building.

    Over the next few hours, parents arrived, overjoyed to find their children. The next day, it was clear: All of Henryville's people were safe.

    There were so many sad and frightening stories. Some students saw the tornado with their own eyes. Some lost their homes. But many described how the community (社区) came together to help and support each other. "You learn what's important," Mrs. Goodknight says.

My Favourite Books

    Jo Usmar is a writer for Cosmopolitan and co-author of the This Book Will series（系列）of lifestyle books. Here she picks her top reads.

    Matilda

    Roald Dahl

    I once wrote a paper on the influence of fairy tales on Roald Dahl's writing and it gave me a new appreciation for his strange and delightful words. Matilda's battles with her cruel parents and the bossy headmisres, Miss Trunchbull, are equally funny and frightening, but they're also aspirational.

    After Dark

    Haruki Murakami

    It's about two sisters-Eri, a model who either won't or can't stop sleeping, and Mari, a young student. In trying to connect to her sister. Mari starts changing her life and discovers a world of diverse "night people" who are hiding secrets.

    Gone Girl

    Gillian Fynn

    There was a bit of me that didn't want to love this when everyone else on the planet did but the horror story is brilliant. There's tension and anxiety from the beginning as Nick and Amy battle for your trust. It's a real whodunit and the frustration when you realise what's going on is horribly enjoyable

    The Stand

    Stephen King

    This is an excellent fantasy novel from one of the best storytellers around. After a serious flu outbreak wipes out 99.4% of the world's population, a battle unfolds between good and evil among those let. Randall Flagg is one of the scariest characters ever.

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