Grown-ups are often surprised by how well they remember something they learned as children but have never practiced ever since. A man who has not had a chance to go swimming for years can still swim as well as ever when he gets back in the water. He can get on a bicycle after many years and still ride away. He can play catch and hit a ball as well as his son. A mother who has not thought about the words for years can teach her daughter the poem that begins "Twinkle, twinkle, little star" or remember the story of Cinderella or Goldilocks and the Three Bears.

    One explanation is the law of overlearning, which can be stated as follows: Once we have learned something, additional learning trials increase the length of time we will remember it.

    In childhood we usually continue to practice such skills as swimming, bicycle riding, and playing baseball long after we have learned them. We continue to listen to and remind ourselves of words such as "Twinkle, twinkle, little star" and childhood tales such as Cinderella and Goldilocks. We not only learn but overlearn.

    The multiplication tables(乘法口诀表) are an exception to the general rule that we forget rather quickly the things that we learn in school, because they are another of the things we overlearn in childhood. The law of overlearning explains why cramming (突击学习) for an examination, though it may result in a passing grade, is not a satisfactory way to learn a college course. By cramming, a student may learn the subject well enough to get by on the examination, but he is likely soon to forget almost everything he learned. A little overlearning, on the other hand, is really necessary for one's future development.

    A chip inserted in a young quadriplegic's (四肢麻痹患者) brain is already improving his quality of life. Soon the benefits may be more widespread.

    A 25-year-old man unable to move from the neck down recently did what many assumed impossible. After a knife attack that had left him paralyzed, all he could move was his head, which he used to push a switch and call for a nurse. And he could turn his wheelchair by blowing into a straw near his face. That was it.

    Then last June, a Foxborough (Mass.) company called Cyber Kinetics opened the man's skull and inserted a special chip no larger than a baby aspirin. That insert has given him a few additional and precious abilities. When connected to a special computer via a cable, the chip translates the young man's thoughts into commands that let him move a cursor across a PC screen and open e-mail. He can draw a circle with a computer painting program. And he can use a robotic hook(钩) to perform simple tasks like picking up a candy and sliding it across a table.

    All he has to do is to think.

    Several new studies have begun or been completed in the past year. In fact, more than half of the scientific papers in this field, called brain-to-computer interaction (BCI), have been published in the past two years, notes Jonathan Wolpaw, a research physician at Wadsworth Center, the New York State Health Dept.'s research laboratory.

    Brain surgeries (手术) are no longer rare: Thousands of Parkinson's disease patients have had special devices inserted in their brains to ease uncontrollable shaking and other symptoms. The inserts themselves have improved, so the body doesn't reject them as furiously(猛烈地). And significant development has been achieved in software used to interpret the brain's signals and change them into commands understood by computers.

    But increased demand for thought technology remains the biggest reason for the field's progress. Today, 4 million Americans live with paralysis according to the Christopher Reeve Paralysis Foundation.

    Scientists hope that thought technology will reduce the impact of such disabilities. People with spinal-cord injuries, for example, often lose their ability to walk because the communications network between their brain and their legs has been interrupted. The brain still commands the leg muscles to move, but they don't hear its orders.

    Thought technology, scientists hope, will bridge this communications gap. "Our goal is for you to see paralyzed people eating at a restaurant and for you not to know that they are paralyzed," says John Donoghue, founder and chief scientific officer at Cyber Kinetics.

    Here is an astonishing and significant fact：Mental work alone can't make us tire. It sounds absurd．But a few 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 (霉素) 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.

    Someone has put forward a dream home which is so advanced that its kitchen can suggest what to make with certain things. Also, a Microsoft home doesn't just warn you when you're out of milk—it can send you a fresh gallon.

    But are these innovations just magic, or are they really coming soon to a neighborhood near you? To find out, US News asked some experts to get their opinions about the home of the not-so-distant future. Here's a look at the innovations.

    The housing boom was marked by mass-produced buildings filled with units which look the same. The coming years, however, will give way to a personalized approach to home construction, with houses as more of an instrument of self-expression. "The successful builders will be the ones that figure out how to change their production model enough to make the buyers feel like they are really getting something that is designed for them, not just a model," says Kermit Baker, the chief economist at the American Institute of Architects.

    Future homes will probably shrink. "We will be building smaller but smarter houses," says Ed McMahon, a senior resident fellow at the Urban Land Institute. "Instead of having a room for just one use, consumers will demand homes that make better use of space," says Susanka, whose best-selling book, The Not So Big House, has become increasingly influential in home design. Seldom-used quarters, such as dining and living rooms, will be replaced with space that can serve both functions. "The goal of his 'right-size' home is to fit its owners like a specially cut suit rather than a jacket you buy in a store," says Susanka.

    What do you usually do to comfort your friends when they are sad? You probably pat them on the shoulder, or give them a warm hug.

    We used to think that knowing when and how to comfort others was an ability that only humans have. But scientists have discovered that apes (猩猩) have this ability too.

    Two researchers from Emory University in Atlanta, US, went to an Ape Protection Centre in Congo to study bonobos (倭黑猩猩), which are closely related to humans.

    The researchers analyzed the bonobos' reactions (反应) after more than 370 cases of stressful situations, such as fights and losing temper, and found that some bonobos rushed to hug those that were screaming after being attacked, just like humans would have done.

    However, researchers found that not all bonobos were able to comfort others. In the protection center, many bonobos are orphans whose mothers were killed by hunters. They were found to be more worried in times of tension and have greater difficulty controlling their own emotions, making them worse at reaching out to help friends in need.

    "Orphans, who have not had the benefit of a mother helping them handling their emotions, are much worse at comforting others," Professor Frans de Waal told TheTelegraph. "Bonobos with moms were able to curb their negative emotional reactions more quickly. Therefore, they pay more attention to others."

    This pattern mirrors the way that human children have been found to react. Those who are good at handling their own emotions—for example, those who can calm themselves down more quickly after upsetting experiences—are usually better at expressing their concerns for others.

    I started reading Shakespeare when I was nine, after my grandfather, an actor, sent me a copy of Romeo and Juliet. The story and the language attracted me. I found out about Shakespeare Globe Centre New Zealand (SGCNZ) and started volunteering for them when I was about 10. When I was 13, I managed to run a film project with SGCNZ.

    I'm home-educated and a part-time correspondence student (函授生) as well. We have a drama group made up of quite a few people who are also home-educated .I've also joined Wellington Young Actors, a youth theatre company. There are many similarities and differences between being home-educated and attending a five-day programme. I love hearing other students' reactions when meeting them and share my different ways of experiencing the world with them. While explaining the way I learn can be a challenge, I love helping people to understand there isn't just one way of learning.

    Being home-educated has offered me the freedom to have an individualized education and to pursue my passions. My education has always been about making those focuses but I do lots of the same things as people who attend five-day programs do. Shakespeare is a great approach to lots of things around English, history and the arts. I think something you learn when you perform is connection. You have to have a connection with your fellow actors, with the audience and with Shakespeare. I learn this from actually being on stage and from taking part in different Shakespeare festival programs.

    I believe it's the emotion in Shakespeare that makes it relevant today. You can be reading something that was written 400 years ago and be able to see parts of your life in the work as it shows you how to understand the world and explore a lot of different ideas.