A guiding principle for master cellist Yo-Yo Ma is that “the intersection(交汇) of cultures is where new things appear.” Certainly his biography is an intersection of cultures. He was born to Chinese parents in Paris, France; both his parents were musicians. When he was seven, his family moved to the United States. Gifted for his age, Ma attended Juilliard, the world famous music institute. He then chose to earn a liberal arts degree at Harvard rather than focusing only on music.

    Even in his earliest performing years, Yo-Yo Ma had a strong belief that it was important to share music with all kinds of people. Stories are told about how he once performed in the hallway of a large building for people who were unable to get tickets to his concert. He remained interested in making music accessible to diverse audiences and furthered his interest in different cultures when he visited the Bushmen of the Kalahari. He developed a vehicle to further these ideals when he founded the Silk Road Project.

    As he has said, the Silk Road is a metaphor(隐喻) for a number of things: as the Internet of ancient times, the routes were used for trade, by religious people, adventurers, scientists, storytellers. Everything from algebra to Islam moved along the Silk Road. It's the local-global thing. In the cultural world, you want to make sure that voices don't get lost, that rich traditions continue to live, without becoming common.

    This lesson explores the philosophy behind Yo-Yo Ma's founding of the Silk Road Ensemble(乐团), his belief that the arts, and particularly music, can make the world better, and that through cooperation, one can both preserve tradition and shape cultural evolution. Students also explore their own attitudes toward the arts, writing reflective essays on how the arts have played a role in their own lives.

    How to Create a Mind Map

    Most of us think visually but we write textually. {#blank#}1{#/blank#} It also makes the information we list more difficult to process, remember, and share.

    {#blank#}2{#/blank#} It combines the brain's visual nature with our tendency to write down words. We end up with a diagram that combines logic and order in a less structured manner. This promotes clearer thinking and better comprehension.{#blank#}3{#/blank#} 

    So, how do you create a mind map? The most basic method is to just use a pen and paper, or a marker and whiteboard. It begins with a central topic or idea, then flows outward.{#blank#}4{#/blank#} The next level of topics is represented by branches extending from it.

    There aren't really any rules for creating mind maps. While most flow outwardly from the central topic, some users prefer to build mind maps in one direction.{#blank#}5{#/blank#} This can make groups of ideas easier to identify and remember. It also makes a mind map more enjoyable to create and use.

    Mind maps are extremely effective for taking notes, planning a project, brainstorming an idea, presenting information to others, and many other uses. Take out your pen and have a try.

A. They help to clarify thinking.

B. This goes against how our minds actually work.

C. They help us save time by focusing on key issues.

D. A mind map is the perfect answer to this dilemma.

E. Think of it as a tree, where the central point is the trunk.

F. It's also a lot more enjoyable than simply writing down lists.

G. Others like to add colors, pictures, or symbols in their mind maps.

    Teenagers who spend hours in front the television may have a poorer diet as young adults.

    A study, which included nearly 1,400 high school students, found those who watched TV for five hours or more per day had less healthy diets than peers(同龄人) five years later. Why does this happen? Should the parents take any measures?

    On the one hand, people who spend a lot of time in front of the TV, especially teenagers, may snack more, and that may affect their long-term diet quality.

    On the other hand, TV ads for fast food, sweets and snacks tempt teenagers to eat more of those foods. And TV time might also replace exercise time for some kids.

    Lead researcher Dr. Daheia J. Barr-Anderson, of the University of Minnesota in Minneapolis, told Reuters Health a clear correlation between TV time during high school and diet quality in young adulthood. While the heaviest TV viewers were eating the most junk food, those who'd watched less than two hours per day had the highest intake(吸收) of fruits, vegetables, whole grains and high-calcium food. In her opinion, parents should limit and monitor TV viewing.

      As far as I am concerned, children should watch no more than two hours of television per day. And parents should set a good example by eating right, being physically active and curbing their own TV time.

    Researchers at Brigham found about one in five teenagers now have some degree of hearing damage. The researchers did not say why hearing loss has risen, but other experts have strong suspicions. One likely culprit, they say, is MP3 players.

    An MP3 player can be dangerous to hearing when its decibel level is turned up too high. High-decibel sounds can damage nerve endings, called hair cells. If a sound is loud enough, the damage can be permanent. A loud sound can shake the membrane (薄膜) on which the hair cells sit- “like an earthquake”. That shake can break or even uproot hair cells. When that happens, the hair cells are finished. Human ears cannot regrow hair cells. Therefore, when listening to an MP3 player, set a volume limit and avoid exposure to loud sounds.

    On the other hand, the loudness of today's music may not be totally under your control. Music companies have been purposely turning up the volume. It's a trend called the fight for loudness.

    Play a CD from the 1990s. Then play a newly released tune. Don't touch the volume control. You'll probably notice that the new CD sounds louder than the old one. Why? Sound engineers who create CDs are using dynamic range compression (压缩), a technology that makes the quiet parts of a song louder and the loud parts quieter. The overall effect of compression is a louder recording.

    Many musicians and sound engineers aren't pleased. They say that compression is driving down the quality of today, s music, making it sound flat and blaring. Gray Hobish, a sound engineer, explains that music should be a combination of loudness and softness. But music companies want to make music louder so it will stand out. That's important in the competition among recording companies.

    What about listeners? Many teenagers listen to music on the go in noisy places and through headphones, all of which reduce sound quality. So young listeners may not notice the poorer quality of modem recordings. “To their ears,” says Hobish, “the music sounds fine. And they are not aware of the hidden threat of the music they are enjoying.”

    After Mom died, I began visiting Dad every morning before I went to work. He was frail and moved slowly, but he always had a glass of freshly squeezed orange juice on the kitchen table for me, along with an unsigned note reading, "Drink your juice." Such a gesture, I knew, was as far as Dad had ever been able to go in expressing his love. In fact, I remember, as a kid I had questioned Mom "Why doesn't Dad love me?" Mom frowned, "Who said he doesn't love you?" "Well, he never tells me," I complained. "He never tells me either," she said, smiling. "But look how hard he works to take care of us, to buy us food and clothes, and to pay for this house. That's how your father tells us he loves us."

    I nodded slowly. I understood in my head, but not in my heart. I still wanted my father to put his arms around me and tell me he loved me. Dad owned and operated a small scrap (片) metal business, and after school I often hung around while he worked. Dad fed scrap steel into a machine which looked like a giant pair of scissors with blades thicker than my father's body. If he didn't feed those terrifying blades just right, he risked serious injury. "Why don't you hire someone to do that for you?" Mom asked Dad one night as she bent over him and rubbed his aching shoulders . "Why don't you hire a cook?" Dad asked, giving her one of his rare smiles.

    Many years later, during my first daily visit, after drinking the juice my father had squeezed for me, I walked over, hugged him and said, "I love you, Dad." From then on I did this every morning. My father never told me how he felt about my hugs, and there was never any expression on his face when I gave them.

    Closeness and independence are both important in our life. Though all humans need both of them women tend to focus on the first and men on the second. It is as if their lifeblood ran in different directions.

    These differences can give women and men differing views of the same situation, as they did in the case of couple I will call Tracy and Brian. When Brian's old high school friend called him at work and announced he'd be in town on business the following month, Brian invited him to stay for the weekend. That evening he informed Tracy that they were going to have a houseguest, and that he and his friend would go out together the first night to chat like old times. Tracy was upset. She was going to be away on business the week before, and the Friday night when Brian would be out with his friend would be her first night home. But what upset her the most was that Brian had made these plans on his own and informed her of them, rather than discussing them with her before extending the invitation.

    Tracy would never make plans, for a weekend or an evening, without first checking with Brian. She can't understand why he doesn't show her the same courtesy and consideration that she shows him. But when she protests, Brian says, "I can't say to my friend, 'I have to ask my wife for permission'!"

    To Brian, checking with his wife means seeking permission, which implies that he is not independent, not free to act on his own. To Tracy, checking with her husband makes her feel good to know and show that she is involved with someone, that her life is bound up with someone else's.

    Tracy and Brian both felt upset by this incident because it cut to the core of their primary concerns. Tracy was hurt because she sensed a failure of closeness in their relationship: He didn't care about her as much as she cared about him. And he was hurt because he felt she was trying to control him and limit his freedom.