During my early twenties, to make my parents stop feeling angry, and simply to escape, I decided to live in my birthplace for a period of time, something I'd sworn I would never do. My parents were thrilled. They prayed that I'd come back triumphantly with a picture－perfect bridegroom. That was the furthest thing from my mind as I packed my faded jeans, tank tops, boots, and a photo of my freckle－faced then－boyfriend who was of Scottish descent.

    The moment I landed in Seoul, I was aware of how much I felt like a misfit. All my life I had tried to blend into the dominant culture and couldn't. And finally, when I was in a place where everyone looked like me, I still stood out. I took it for granted that I'd feel a sense of freedom. I thought I'd blend into the landscape. This was not the case. People stared at me with curious eyes. I became conscious of my American－girl swaggering body movements and inappropriate dress.

    Collecting my courage, I traveled to the demilitarized zone on my own. I touched the high barbed－wire fence that stretched across the belly of the peninsula(半岛), dividing Korea in half. I visited thousand－year－old temples and magnificent palace gates that had survived modernization and centuries of battle. I met with distant cousins who welcomed me with outstretched arms into their homes and related heroic tales about my mother and Halmoni (Grandmother) during the war. How Halmoni had led her young children out of north to the United Nation－backed south. How my mother, at the age of thirteen, saved the life of her baby sister.

    I listened with such an overwhelming thirst that when I returned to the States a year and a half later, I began to ask my parents and Halmoni (who had immigrated to the States some time after we did) all about the past. The past was no longer a time gone by, a dead weight. I now saw that it held ancient treasures. And the more I dug and discovered, the more I felt myself being steered toward a future I had never imagined for myself. I began to write. I didn't even know I could write. My family helped me knit stories into a book using Halmoni's voice. As her powerful words moved through me I was able to reflect and meditate on the ridiculous life I had fashioned for myself. I could feel my sense of self rising. This sparked a newfound awareness and excitement. I became a spokeswoman on Korean culture, traveling to various college campuses across the country. “Be proud. Embrace your heritage.” I said to young Korean American students wearing extra－large, trendy sportswear. But the whole time I was lecturing, I had very little understanding of what that self－concept meant. I was merely talking the talk. I hadn't yet fully embraced my own identity.

    Uthman Affan was a very rich man who was known for his generosity. In fact he was so generous that people still tell stories about him today, more than a thousand years later.

    Uthman lived in Medina. It is a very dry part of the world where there isn't a lot of rainfall. One year, the rain didn't come and there was a drought（干旱）. People were running out of food. Things got so bad that the people had to eat leaves from the trees in order to survive.

    You can imagine how happy the people and the merchants（商人）were when they learned that a group of camels（骆驼）were approaching Medina. Each camel carried a lot of food, and the people looked forward to being able to eat good food again. Knowing that the group belonged to Uthman made the people even happier, for they knew he is well-known for generosity. But it was not welcome news for the merchants in Medina, because Uthman was a very sharp businessman. Although he was fair, Uthman drove a very hard bargain.

    Even so, the merchants immediately went to Uthman. They wanted to buy the food on the camels from him so they could sell it for two or even three times its usual price at that time. So they were ready to pay any price Uthman asked. But Uthman turned them down. The merchants raised their offers again and again, but each time Uthman refused. Finally the merchants made their best offer: five times the value of the food. Guess what? Uthman had made a decision to give away all the food to the starving people of Medina.

    Justin Bieber is only fifteen years old and has become very popular already. He was raised (抚养) by his mother in Stratford, Ontario, Canada. When he was twelve he won second place in a local singing contest. He started posting (贴) videos of his contest performances on the Internet for his friends and family. Soon these videos had been seen more than ten million times.

    A music manager saw those videos and asked Justin to fly to Atlanta, Georgia, to meet the singer and songwriter Usher. A year later Justin released (发行) his first albumMy World. It sold over a million copies in the first two months. Four singles were released before the album. All became popular. This made Justin Bieber the only singer in the history of the Billboard magazine to have four singles from his first album among the most popular songs before the album's release.

    Justin Bieber performed for President Obama at the White House last December. He was part of a musical show that raised money for the National Children's Medical Center. He was also among the many singers who recorded the song We Are the World. The song was produced to raise money for Haiti. The video has been seen more than seven million times on the Internet. And it was shown during the opening ceremony of the 2010 Winter Olympics in Vancouver.

    Justin Bieber's family did not have much money when he was young. He did not have as much so other children did. Justin says he wants to influence young people in a good way. He believes that you can do anything if you put your mind to it.

    A build-it-yourself solar still（蒸馏器） is one of the best ways to obtain drinking water in areas where the liquid is not readily available. Developed by two doctors in the U. S. Department of Agriculture, it's an excellent water collector. Unfortunately, you must carry the necessary equipment with you, since it's all but impossible to find natural substitutes. The only components required, though, are a 5＇  5＇ sheet of clear or slightly milky plastic, six feet of plastic tube, and a container — perhaps just a drinking cup — to catch the water. These pieces can be folded into a neat little pack and fastened on your belt.

    To construct a working still, use a sharp stick or rock to dig a hole four feet across and three feet deep. Try to make the hole in a damp area to increase the water catcher's productivity. Place your cup in the deepest part of the hole. Then lay the tube in place so that one end rests all the way in the cup and the rest of the line runs up — and out — the side of the hole.

    Next, cover the hole with the plastic sheet, securing the edges of the plastic with dirt and weighting the sheet's center down with a rock. The plastic should now form a cone(圆锥体) with 45-degree-angled sides. The low point of the sheet must be centered directly over, and no more than three inches above, the cup.

    The solar still works by creating a greenhouse under the plastic. Ground water evaporates (蒸发) and collects on the sheet until small drops of water form, run down the material and fall off into the cup. When the container is full, you can suck the refreshment out through the tube, and won't have to break down the still every time you need a drink.

    The smallest kids on Earth are much smaller than you or your baby brother or sister. They're even smaller than the hairs on your head. We call them “NanoPutians”(纳米小人). Also known as NanoKids, the NanoPutians aren't real people. They are actually tiny molecules (分子) made to look a little bit like people.

    James Tour invented the NanoPutians as a way to teach kids about nanoscience, which refers to the study of things that are smaller than about 100 or 200 nanometers. “The exact size is less important than the possible applications of working with such tiny things,” Tour says, “Nanoscience is the study and development of the small so that it will affect the large.”

One of the goals of the research is to control individual atoms. Carbon, hydrogen, oxygen, and other types of atoms are the building blocks of the universe. They make up planets, rocks, people, trees, CDs — all the stuff out there. “Most things that people build come together in a top-down way”, Tour says. If you want to make a table, for instance, you cut down a big tree, make wooden boards, and hammer them together. Nature, on the other hand, builds things from the bottom up. When atoms join together they make molecules. Each molecule has a certain shape, and a molecule's structure determines what it can do. Molecules can make them come together to make a cell — or a tree.

    Tour and his co-workers turned these molecular structures into cartoon figures and made an animated(动画的) science video about the little people, set it to music and started showing it to kids in school while talking about how exciting research on small things can be.

    “Learning about the NanoKids has opened up a world of possibility for real kids who ordinarily would rather not study biology, chemistry or physics.” Tour says. When you look closely enough, the really small can be really cool.

    Can you remember the day when you spoke your first word? If you can, you are unusual. Try to imagine what first few months of your life were like. I am sure you just spent most of your time eating, sleeping and crying. As you grew older, you were awake more of the time. It took your parents more time to play with you and talk to you. You watched and listened curiously (好奇). You began to know that people made certain sounds to go with certain things.

    Then you began to try making the sounds you heard. And step by step you were able to make the right sound for one thing. On that day you came to understand the secret of language. The secret is that a certain sound means a certain thing. One sound might be as good as another. But it is no good as a word unless everybody agrees on its meaning. Only when a group of people use the same set of sounds of things, can they understand each other. Then, and only then do these people have a LANGUAGE.

    After you found the secret of language, you learned words. Some of the words meant things, such as BOOKS, CHAIRS and SHOES. Some words meant doing things, such as GO and SWIM, and other words describe things, such as GOOD and DIRTY. Soon you learned to put words together to express your idea, such as “I want to go out and play with my friends.” This is language. By means of language people can communicate. So we say languages are means of communication.