3 . Researchers say they have translated the meaning of gestures that wild chimpanzees (黑猩猩) use to communicate. They say wild chimps communicate 19 specific messages to one another with a “vocabulary” of 66 gestures. The scientists discovered this by following and filming groups of chimps in Uganda, and examining more than 5,000 incidents of these meaningful exchanges.

Dr Catherine Hobaiter, who led the research, said that this was the only form of intentional communication to be recorded in the animal kingdom. Only humans and chimps, she said, had a system of communication where they deliberately sent a message to another group member.

“That’s what’s so amazing about chimp gestures,” she said. “They’re the only thing that looks like human language in that respect.”

Although previous research has shown that apes and monkeys can understand complex information from another animal’s call, the animals do not appear to use their voices intentionally to communicate messages. This was a significant difference between calls and gestures, Dr Hobaiter said.

Chimps will check to see if they have the attention of the animal with which they wish to communicate. In one case, a mother presents her foot to her crying baby, signaling: “Climb on me.” The youngster immediately jumps on to its mothers back and they travel off together. “The big message from this study is that there is another species (物种) out there. that is meaningful in its communication, so that’s not unique to humans,” said Dr Hobaiter.

Dr Susanne Shultz, an evolutionary biologist from the University of Manchester, said the study was praiseworthy in seeking to enrich our knowledge of the evolution of human language. But, she added, the results were “a little disappointing”.

“The vagueness of the gesture meanings suggests either that the chimps have little to communicate, or we are still missing a lot of the information contained in their gestures and actions,” she said. “Moreover, the meanings seem to not go beyond what other animal convey with non-verbal communication. So, it seems the gulf remains. ”

One fall, my wife Elli and I had a single goal: to photograph polar bears. We were staying at a research camp outside “the polar bear capital of the world”-the town of Churchill in Manitoba, Canada.

Taking pictures of polar bears is amazing but also dangerous. Polar bears-like all wild animals should be photographed from a safe distance. When I'm face to face with a polar bear, I like it to be through a camera with a telephoto lens. But sometimes，that is easier said than done. This was one of those times.

As Elli and I cooked dinner, a young male polar bear who was playing in a nearby lake sniffed, and smelled our garlic bread.

The hungry bear followed his nose to our camp, which was surrounded by a high wire fence. He pulled and bit the wire. He stood on his back legs and pushed at the wooden fence posts.

Terrified, Elli and I tried all the bear defense actions we knew. We yelled at the bear, hit pots hard，and fired blank shotgun shells into the air. Sometimes loud noises like these will scare bears off. Not this polar bear though-he just kept trying to tear down the fence with his massive paws(爪子).

I radioed the camp manager for help. He told me a helicopter was on its way, but it would be 30 minutes before it arrived. Making the best of this close encounter(相遇), I took some pictures of the bear.

Elli and I feared the fence wouldn’t last through 30 more minutes of the bear's punishment. The camp manager suggested I use pepper spray. The spray burns the bears’ eyes, but doesn't hurt them. So I approached our uninvited guest slowly and，through the fence, sprayed him in the face. With an angry roar(吼叫), the bear ran to the lake to wash his eyes.

6 . Challenging work that requires lots of analytical thinking, planning and other managerial skills might help your brain stay sharp as you age, a study published Wednesday in the journal Neurology suggests.

Researchers from the University of Leipzig in Germany gathered more than 1, 000 retired workers who were over age 75 and assessed the volunteers’ memory and thinking skills through a battery of tests. Then, for eight years, the scientists asked the same group to come back to the lab every 18 months to take the same sorts of tests.

Those who had held mentally stimulating(刺激), demanding jobs before retirement tended to do the best on the tests. And they tended to lose cognitive(认知) function at a much slower rate than those with the least mentally challenging jobs. The results held true even after the scientists accounted for the participants’ overall health status.

“This works just like physical exercise, ” says Francisca Then, who led the study. “After a long run, you may feel like you’re in pain, you may feel tired. But it makes you fit. After a long day at work-sure, you will feel tired, but it can help your brain stay healthy. ”

It's not just corporate jobs, or even paid work that can help keep your brain fit, Then points out. A waiter’s job, for example, that requires multitasking, teamwork and decision-making could be just as stimulating as any high-level office work. And “running a family household requires high-level planning and coordinating(协调), ” she says. “You have to organize the activities of the children and take care of the bills and groceries. ”

Of course, our brains can decline as we grow older for lots of reasons-including other environmental influences or genetic factors. Still, continuing to challenge yourself mentally and keeping your mind busy can only help.

7 . I experienced years of loneliness as a child.     1     His friends teased him about babysitting his sister and his interests were far different from mine. With no other kids of my age in the neighborhood, I had to spend hours by myself.

A bright spot for me turned out to be reading. My love of the written word began early as my mother read to me every evening.     2     I started reading books on my own before age 5 and my mother took me to the public library once a week to borrow several books. I quickly graduated from typical children’s books to ones with fewer pictures and longer chapters. Reading opened new worlds to me.     3    

My mother also encouraged me to make what I wanted. I tried making toy cars with cardboard boxes and constructing buildings from leftover cardboard and bits of wood my father gave me. When my mother saw my creations, she told me how creative my designs were.     4     I learned a lot about how to extend the life of objects and transform them into something new and useful. It was a trait(特点) others found helpful, and I soon had friends who wanted to make things with me.

    5    My parents made it a point for their two kids to spend time outside, no matter the weather or season. My brother, of course, raced off to be with his friends, while I had plenty to do myself. There was making leaf houses in autumn, ice skating in winter, and so much more. They’re all memories I treasure today.

Parents everywhere praise their kids. Jenn Berman, author of The A to Z Guide to Raising Happy and Confident Kids, says, “We’ve gone to the opposite extreme of a few decades ago when parents tended to be more strict.” By giving kids a lot of praise, parents think they’re building their children’s confidence, when, in fact, it may be just the opposite. Too much praise can backfire and, when given in a way that’s insincere, make kids afraid to try new things or take a risk for fear of not being able to stay on top where their parents’ praise has put them.

Still, don’t go too far in the other direction. Not giving enough praise can be just as damaging as giving too much. Kids will feel like they’re not good enough or that you don’t care and, as a result, may see no point in trying hard for their accomplishments.

So what is the right amount of praise? Experts say that the quality of praise is more important than the quantity. If praise is sincere and focused on the effort not the outcome, you can give it as often as your child does something that deserves a verbal reward. “We should especially recognize our children’s efforts to push themselves and work hard to achieve a goal,” says Donahue, author of Parenting Without Fear: Letting Go of Worry and Focusing on What Really Matters. “One thing to remember is that it’s the process not the end product that matters.”

Your son may not be the best basketball player on his team. But if he’s out there every day and playing hard, you should praise his effort regardless of whether his team wins or loses. Praising the effort and not the outcome can also mean recognizing your child when she has worked hard to clean the yard, cook dinner, or finish a book report. But whatever it is, praise should be given on a case-by-case basis and be proportionate(相称的) to the amount of effort your child has put into it.