Do you know how it is when you see someone yawn and you start yawning too? Or how hard it is to be among people laughing and not laugh yourself? Well, apparently it's because we have mirror neurons (神经元）in our brains.

    Put simply, the existence of mirror neurons suggests that every time we see someone else do something, our brains imitate (模仿)it，whether or not we actually perform the same action. This explains a great deal about how we learn to smile, talk, walk, dance or play sports. But the idea goes further： mirror neurons not only appear to explain physical actions _y they also tell us that there is a biological basis for the way we understand other people.

    Mirror neurons can undoubtedly be found all over our brains, but especially in the areas which relate to our ability to use languages, and to understand how other people feel. Researchers have found that mirror neurons relate strongly to language. A group of researchers discovered that if they gave people sentences to listen to ( for example ："The hand took hold of the ball" ) , the same mirror neurons were triggered as when the action was actually performed (in this example, actually taking hold of a ball).

    Any problems with mirror neurons may well result in problems with behavior. Much researeh suggests that people with social and behavioral problems have mirror neurons which are not fully functioning. However, it is not yet known exactly how these discoveries might help find treatments for social disorders.

    Research into mirror neurons seems to provide us with ever more information concerning how humans behave and interact(互动）.Indeed, it may turn out to be the equivalent (相等物）for ncurosciencc of what Einstein's theory of relativity was for physics. And the next time you feel the urge to cough in the cinema when someone else does--well，perhaps you'll understand why.

    Mark Twain left school when he was twelve. He had little school education. In spite of (尽管) this, he became the most famous writer of his time. He made millions of dollars by writing. His real name was Samuel Langhorne Clemens, but he is better known all over the world as Mark Twain, his pen-name.

    Mark Twain was born in 1835 and he was not a healthy baby. In fact, he was not expected to live through the first winter. But with his mother's tender care, he managed to survive. As a boy, he caused much trouble for his parents. He used to play jokes on all of his friends and neighbors. He didn't like to go to school, and he constantly ran away from home. He always went in the direction of the nearby Mississippi (密西西比河). He was nearly drowned (淹死) nine times.

    After his father's death in 1847, Mark twain began to work for a printer, who only provided him with food and clothing. Then, he worked as a printer, a river-boat pilot and later joined the army. But shortly after that he became a miner. During this period, he started to write short stories. Afterwards he became a full-time writer.

    In 1870, Mark Twain got married. In the years that followed he wrote many books including Tom Sawyer in 1876, and Huckleberry Finn in 1884, which made him famous, and brought him a great fortune (财富).

    Unfortunately, Mark Twain got into debts in bad investments (投资) and he had to write large numbers of stories to pay these debts. In 1904, his wife died, and then three of their children passed away.

    At the age of 70, his hair was completely white. He bought many white suits and neckties. He wore nothing but white from head to foot until his death on April 21, 1910.

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    Consider the tomato: easy to grow, healthy to eat, tasty in just about any dish and pleasant to look at. And come late summer, in steady supply. Though you can find it during the coldest winter months.

    August is the tomato's season to shine. Farmers' markets and stores are bursting with less known but tastier varieties, including purple cherries and big heirlooms.

    "Heirlooms ripened on the vine(藤) are the tastiest of all tomatoes," says Amy Goldman Fowler, author of The Heirloom Tomato. "I think their beauty is more than skin-deep." Heirloom seeds have been around for at least 50 years, often passed down from generation to generation. You may hear cherry or heirloom used to describe a tomato at hand, but there are many different kinds of tomatoes, and growers have fun giving fancy names to varieties: Mortgage Lifters, Beefsteaks, Oxhearts, Early Girls.

    And all of them come with health benefits. Tomatoes are a good source of the antioxidant lycopene (抗氧化番茄红素), which is thought to help lower a person's risk for heart problems and cancer. Tomatoes also contain healthy vitamins A and C. For the best fruit, choose tomatoes with shiny, firm skin and a little give, and store them at room temperature away from direct sunlight. Keep them out of the fridge, since cold temperatures can affect the original taste.

    "They satisfy something more than just taste," says Fowler. "Tomatoes feed your soul."

    More than 20 years ago, a skeleton called Little Foot turned up in a South African cave. The nearly complete skeleton was a member of the human family. Now researchers have freed most of the skeleton from its stony shell and analyzed the fossils (化石) and they say 3.67-million-years-old Little Foot belonged to a unique species.

    Researcher Ronald Clarke and his colleagues think Little Foot belonged to A. Prometheus (普罗米修斯南猿). Clarke works at the university of the Witwatersrand in Johannesburg South Africa. He studies fossilized humans and our relatives. Their foundings, published in four papers, have suggested the species A.Prometheus might have existed. Clarke has believed in that species for more than a decade, he found the first Little Foot's remains in a storage box of fossils in 1994. People began digging out the rest of the skeleton in 1997.

    Many other researchers instead argue that Little Foot likely belonged to a different species, which is known as A.africanus (南方古猿非洲种). Researcher Raymond Dart first identified A.africanus in 1924. He was studying the skull (头颅骨) of an ancient youngster called the Taung Child. Since then, people have turned up hundreds more A. africanus fossils in South African caves. Those include Sterkfontein, where Little Foot was found.

    The braincase is the part of the skull that holds the brain. And researchers found a partial braincase that Dart thought belonged to a different species in Makapansgat, one of those other caves. In 1948, Dart called this other species A. Prometheus, but he changed his mind after 1955. Instead, he said that braincase and another fossil at Makapansgat belonged to A.africanus. There was no A. Prometheus after all, he concluded.

    Clarke and his colleagues want to bring back the rejected species. They say Little Foot's distinctive skeleton, an adult female that is at least 90 percent complete, is solid evidence for it.

Culture and tradition are the soul of a country. When a country 1 them, it is difficult for it to make 2 . Chinese culture can be seen everywhere in China. 3 , I did not really understand it in the beginning. Then I realized I had to 4 something in order to understand it.

Last winter I decided to stay at our university to 5 all the activities organized for foreign students to celebrate the Spring Festival.

The 6 began a month ago with the decorating of our rooms with Spring Festival couplets (对联) and New Year paintings. On February 10, we 7 an activity to write Spring Festival couplets. When I saw the brush, I became 8 . Why is there such a pen? How do we use it?

After understanding the tools, we started our creative 9 . I tried to hold the brush and start writing 10 , but the tip of the pen was too 11 and I couldn't grasp it at all. I was 12 , but I didn't give up. After several 13 , I wrote a line of words. At this time, I found that my sleeves were dirtied with ink as I was too 14 practicing. Even so, I was very happy, because I felt that I had learned the essence (精髓) of writing calligraphy.

Through this activity, I came to 15 the amazing Chinese culture more.