Since the 1970s, scientists have been searching for ways to link the brain with computers. Brain-computer interface (界面) (BCI) technology could help people with disabilities send commands to machines.

    Recently, two researchers, Jose Milan and Michele Tavella from the Federal Polytechnic schooling 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. Milan, 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.

    A new generation addiction is quickly spreading all over the world. Web holism, a twentieth century disease, affects people from different ages. They surf the net, use e-mail and speak in chat rooms. They spend many hours on the computer, and it becomes a compulsive （强迫的，强制的） habit. They cannot stop, and it affects their lives.

    Ten years ago, no one thought that using computers could become compulsive behavior that could affect the social and physical life of computer users. This obsessional behavior has affected teenagers and college students. They are likely to log on computers and spend long hours at different websites.

    They become hooked on computers and gradually their social and school life is affected by this situation. They spend all free time surfing and don't concentrate on homework, so this addiction influences their grades and success at school. Because they can find everything on the websites, they hang out there. Moreover, this addiction to websites influences their social life.

    They spend more time in front of computers than with their friends. The relation with their friends changes. The virtual life becomes more important than their real life. They have a new language that they speak in the chat rooms and it causes cultural changes in society.

    Because of the change in their behavior, they begin to keep themselves apart from the society and live with their virtual friends. They share their emotions and feelings with friends who they have never met in their life. Although they feel confident on the computer, they are not confident with real live friends they have known all their life. It is a problem for the future. This addictive behavior is beginning to affect all the world.

    Here is an astonishing and significant fact: Mental work alone can't make us tire. It sounds absurd. But a years ago, scientists tried to find out how long the human brain could labor without reaching a stage of fatigue (疲劳). To the amazement of these scientists, they discovered that blood passing through the brain, when it is active, shows no fatigue at all! If we took a drop of blood from a day laborer, we would find it full of fatigue toxins(毒素) and fatigue products. But if we took blood from the brain of an Albert Einstein, it would show no fatigue toxins at the end of the day.

    So far as the brain is concerned, it can work as well and swiftly at the end of eight or even twelve hours of effort as at the beginning. The brain is totally tireless. So what makes us tired?

    Some scientists declare that most of our fatigue comes from our mental and emotional(情绪的) attitudes. One of England's most outstanding scientists, J.A. Hadfield, says, “The greater part of the fatigue from which we suffer is of mental origin. In fact, fatigue of purely physical origin is rare.” Dr. Brill, a famous American scientist, goes even further. He declares, “One hundred percent of the fatigue of sitting worker in good health is due to emotional problems.”

What kinds of emotions make sitting workers tired? Joy? Satisfaction? No! A feeling of being bored, anger, anxiety, tenseness, worry, a feeling of not being appreciated—those are the emotions that tire sitting workers. Hard work by itself seldom causes fatigue. We get tired because our emotions produce nervousness in the body.

    It was a cold winter. The wind blew all night and the snow was blinding. When morning came, my three children and I got up and made our way to the windows. As we looked out the window, we saw that the henhouse was gone. Our three hens had been blown away.

    I looked at the emptiness outside. Then I saw all three chickens sat around the edge of a white bucket. How was this violent wind not blowing them into the field beyond? I quickly pulled on long snow pants and heavy winter coat, wrapped a scarf and stuck my feet into very large boots .

    I shouted at the wind as it blew. I was alone, save for my children. They stared out the window into the vast white sea of snow, their eyes peeled for any sign of movement. Outside I heard the sound of my boots as I walked against the wind.

    The snow circling around me, I steadily made my way to the soft cluck-cluck-cluck sound my hens always made. When I reached them, I saw that their little feet were holding on to the edge of the bucket, heads bent forward and away from the wind. I gently lifted each hen and put it carefully into the warm inside. Then I began the freezing walk back to the small shed directly behind our house. One by one I laid my chickens on the cold floor, and they began to cluck softly.

    As I shut the shed doors, my eyes went directly to the window where my children were watching. They jumped up and down cheering, and so did I! I wasn't some dragon slayer (屠龙者) from a fairy tale. I was simply a mom, but the look on my children's faces told me that they thought I was a hero mom.

    Lennon Flowers' mom was diagnosed with lung cancer when she was a senior in high school. This young woman gave up her big dreams to go to New York University and become an actor and instead entered the University of North Carolina so she could be close to home. Though she was surrounded by a community of friends, she rarely brought up her mom. “I became good at not talking about what was happening to me,” she explains. “I got really, really good at being really, really busy.”

    When her mother died during her senior year in college, many of Lennon's friends hadn't even known she was sick. In part, she said she kept silent about it due to her belief that it protected other people.

    Three years after her mother died, Lennon moved to Los Angeles for a job and, met Carla Fernandez. They had an immediate connection. Later, while apartment hunting side-by-side, Carla admitted that her father had died just six months earlier. Lennon shared her own story. A seed was planted.

    A couple of months later Carla organized a dinner party for five women, Lennon among them. All of them had lost a parent already though they were only in their 20s; all of them had felt alone in that loss.

    An emotional movement was born: The Dinner Party. Today, there are 31 “tables” across the country and the initial organization plans to create even more.

    Lennon says, “As people gather month after month, they branch out from talking about their lost loved ones and start exploring what those losses have taught them about the meaning of life.”

    Sila Sutharat, a roasted chicken street vendor from Phetchaburi, Thailand, has come up with a unique way of cooking chicken. He uses 1, 000 mobile mirrors that concentrate sunlight into a strong beam(光束).

    Like most other street vendors, Sila used to cook his chicken over a charcoal(木炭)fire. But that all changed in 1997, when an ordinary observation gave him a great idea. One day, he was hit by the sunlight reflected off the window of a passing bus, and he felt its heat. "I could possibly change it into energy," Sila told himself. Then he started working on how to make use of the sunlight to cook his chicken.

    "They said that I'd gone mad, and that cooking chicken like this was impossible," Sila told reporters about how people reacted to his idea. But he didn't let their jokes get to him, and in the end he was the one who had the last laugh. He invented a panel featuring 1, 000 small mirrors that could be moved. It worked exactly as he predicted, allowing him to cook a 1.5 kg chicken in just 10 to 15 minutes. "After a long time passed by, they'd say: "Actually, you could do it," " Sila Sutharat recalls. Sila says that his invention can make the temperature go up to 312'C. This is why he always wears a special mask instead of a cook's hat when operating it.

    Sila's solar roaster is an unusual sight. It has attracted quite a few curious people who are eager to taste Sila's sun-cooked chicken. He's been using this cooking method for two decades now. And he says it's much better than traditional roasting methods. It is free, cooks all parts of the chicken, and best of all, it's 100% clean. Phetchaburi Rajabhat University thought Sila's idea was very good and useful, so they awarded him an honorary science degree.