I was driving home from the gym with my children. It was approaching bed time.

    “My legs hurt, I can't walk to the car.” said my son, William. Then be sat on the ground regardless of whatever we said.

    “Maybe you just need a banana? They're good for tired bones.” his sister, Meredith, persuaded him in a wise way.

This was the first time I had heard of the banana's miracle(神奇的) cure for achy bones. It distracted(使分心) William and we were able to make it to the car. His wish for bone relief brought him energy and he persisted(坚持) the entire ride home. Upon arrival, he struggled out of the car and slowly went up 3 steps into the house. While he took his ”medicine”, we arrived on a suitable diagnosis (诊断) for his “illness” —a serious case of Banana Bone. He was probably just over—tired. He had a long day and played hard in the Adventure Room at the gym. Thankfully we kept some bananas in the fridge, and hugs and kisses were given as a booster (辅助药剂) , which gave him the courage to walk upstairs to sleep.

    Banana Bone sounds like something I've had before. The aching hasn't been in my bones so much as in my head and my heart. I think it's a condition related to stress, lack of rest and stretching of one's abilities. Perhaps you're experienced it too. It is about long days facing challenges or pressing against the edges of your own ability without any hope.

    That's when you realize Banana Bone doesn't have to be a physical illness. It can be mental. It can drive emotion. It means you can choose it or you can choose against it. It's not real. It' s your reaction to what's real. I know, it' s still not easy. But it' s part of “growing up”. We must have the courage to overcome it and I believe we can make it﹗

    My advice to you? Eat a banana and go to bed. You'll feel a lot better and be your fresh self in the morning.

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    Writer Liu fang's first novel, about the life of a teacher at a rural school in the mountainous province of Guizhou in the 1990s , is greatly similar to her own early years-before she lost her sight and struggled to find a full life in the darkness.

    Liu, 44 , was a Chinese language teacher at No 3 Middle School in the Baiyun district of Guiyang until 2006 , when she could no longer see the characters printed in the textbooks .

    Diagnosed with incurable eye disease , in 1996 , Liu was told she would gradually lose her eyesight over 10 years.That it took her 20 years to walk into darkness makes her have the ability to tell you the difference between the two worlds .She spent the first 10 years gradually accepting the reality , and the second facing it with smiles.

    Fortunately , Liu had many people on her side.Her family and friends helped her overcome the most difficult period of her life. And her own kindness served her well . Liu praised the school's headmaster , who gave her a new post as a psychological consultant(心理咨询师) for students, and planned for professional training for her new role.

    Liu's office is a comfortable place decorated with hand-drawn student pictures , one where children can thoughtfully talk about their problems . Liu takes her job seriously.She donated 5,000 yuan (＄760) from her income to five poor students.After she became famous, all she wanted to do was help for the “left-behind”children.

    Yang Hui , a student who often quarrelled with her parents , said Liu feels like a mother to the student. Yang said She would listen to me patiently , and Liu helped her find the reason she couldn't get along well with her parents .

Liu said , her blindness is an asset . “I guess they trust me because I cannot see them , and they feel I am more concentrated and careful than others while listening to them.”

    Being sociable looks like a good way to add years to your life. Relationships with family, friends, neighbors, even pets, will all help, but the biggest longevity (长寿) seems to come from marriage. The effect was first noticed in 1858 by William Farr, who wrote that widows and widowers (鳏夫) were at a much higher risk of dying than the married people. Studies since then suggest that marriage could add as much as seven years to a man's life and two to a woman's. The effect can be seen in all causes of death, whether illness, accident or self-harm.

    Even if the chances are all against you, marriage can more than compensate you. Linda Waite of the University of Chicago has found that a married older man with heart disease can expect to live nearly four years longer than an unmarried man with a healthy heart. Similarly, a married man who smokes more than a pack a day is likely to live as long as a divorced man who doesn't smoke. There's a flip side, however, as partners are more likely to become ill or die in the couple of years following their husband or wife's death, and caring for your husband or wife with mental disorder can leave you with some of the same severe problems. Even so, the chances favor marriage. In a 30-year study of more than 10,000 people, Nicholas Christakis of Harvard Medical School describes how all kinds of social networks have similar effects.

    So how does it work? The effects are complicated, affected by socio-economic factors, health-service provision, emotional support and other more physiological mechanisms(生理机制). For example, social contact can promote development of the brain and immune system, leading to better health and less chance of depression later in life. People in supportive relationships may handle stress better. Then there are the psychological benefits of a supportive partner.

    A life partner, children and good friends are all recommended if you aim to live to 100. The overall social network is still being mapped out, but Christakis says: "People are inter-connected, so their health is inter-connected."

    It seems that no one can live a happy life without friendship. While a great number of people expect others to be their friends, they don't give friendship back. That is why some friendships don't last long. To have a friend, you must learn to be one. You must learn to treat your friend the way you want your friend to treat you. Learning to be a good friend means learning three rules: be honest; be generous; be understanding.

    Honesty is where a good friendship starts. Friends must be able to trust one another. If you do not tell the truth, people usually find out. If a friend finds out that you haven't been honest, you may lose your friend's trust. Good friends always depend on one another to speak and act honestly.

    Generosity means sharing and sharing makes a friendship grow. You do not have to give your lunch money or your clothes. Naturally you will want to share your ideas and feelings. These can be very valuable to a friend. They tell your friend what is important to you. By sharing them, you help your friend know better.

    Sooner or later everyone needs understanding and help with each other. Something may go wrong at school. Talking about the problem can make it easier to solve. Turning to a friend can be a first step in solving the problem. So to be a friend you must listen and understand. You must try to put yourself in your friend's place so that you can understand the problem better.

    No two friendships are exactly alike. But all true friendships have three things in common. If you plan to keep your friends, you must practice honesty, generosity and understanding.

    Since 50 years ago, scientists have been searching for ways to link the brain with computers. Brain Computer Interface (BCI) technology could help people with disabilities send commands to machines.

    Recently, two researchers, Jose Millan and Michelle Tavella from the Federal Polytechnic School in Lausanne, Switzerland, demonstrated (展示) a small robotic wheelchair directed by a person's thoughts.

    In the laboratory, Tavella operated the wheelchair just by thinking about moving his left or right hand. He could even talk as he watched the vehicle and guided it with his thoughts.

    "Our brain has billions of nerve cells. These send signals through the spinal cord (脊髓) to the muscles to give us the ability to move. But spinal cord injuries or other conditions can prevent these weak electrical signals from reaching the muscles," Tavella says, "Our system allows disabled people to communicate with external world and also to control devices."

    The researchers designed a special cap for the user. This head cover picks up the signals from the scalp (头皮) and sends them to a computer. The computer interprets the signals and commands the motorized wheelchair. The wheelchair also has two cameras that identify objects in its path. They help the computer react to commands from the brain.

    Prof. Millan, the team leader, says scientists keep improving the computer software that interprets brain signals and turns them into simple commands. "The practical possibilities that BCI technology offers to disabled people can be grouped in two categories: communication, and controlling devices. One example is this wheelchair." He says his team has set two goals. One is testing with real patients, so as to prove that this is a technology they can benefit from. And the other is to guarantee that they can use the technology over long periods of time.

    I always feel sorry for world leaders busy dealing with fights between nations. When my three children were young, most days it was hard to keep my house from becoming a battlefield.

    It got worse as they grew older. Three years ago, Zack, then 16, couldn't make it through a day without making his sisters, Alex 11 and Taryn 9, angry.

    My husband and I tried to be understanding the boy at such an age. We reasoned, punished, and left heartfelt notes on his bed about how he was hurting our family. His answer was" I say it because it's true."

    I even tried telling the girls to fight back. Bad idea. Now I had three children at war. Whatever I said to them, they paid no attention. When there was no way out, I told everything to my sister, Mary, in an e-mail. She replied, "Don't e-mail me. E-mail him."

    Our son was online every day, mailing and talking with his friends. Maybe he would actually hear me this way. I didn't say anything different, but e-mail just took the tension away. There'd be no shouting or door banging. Zack wouldn't feel under attack.

    Zack didn't reply for days. When he finally did, his entire message was four small words. I smiled when I read them: "You're right. I'm sorry."

    The children still fought, of course, but Zack changed. Best of all, I now have a better way to talk with not one but three of them. I like it that they don't tune me out as much as they used to. They like not having to listen to me shouting to them. Or as Alex says, "You're so much nicer online."

    All I know is that the house is quiet. But we're talking.