The evidence for harmony may not be obvious in some families. But it seems that four out of five young people now get on well with their parents, which is the opposite of the popularly-held image of unhappy teenagers locked in their room after endless family quarrels.

    An important new study into teenage attitudes surprisingly shows that their family life is more harmonious than it had ever been in the past. “We were surprised by just how positive today's young people seem to be about their families,” said one member of the research team. “They're expected to be rebellious(叛逆的) and selfish but actually they have other things on their minds: they want a car and material goods, and they worry about whether school is serving them well. There's more negotiation(商议) and discussion between parents and children, and children expect to take part in the family decision-making process. They don't want to rock the boat.”

    So it seems that this generation of parents is much more likely than parents of 30 years ago to treat their children as friends. “My parents are happy to discuss things with me and willing to listen to me,” says 17-year-old Daniel Lazall. “I always tell them when I'm going out clubbing. As long as they know what I'm doing, they're fine with me.” Susan Crome, who is now 21, agrees. “Looking back on the last 10 years, there was a lot of what you could call negotiation. For example, as long as I'd done all my homework, I could go out on a Saturday night. But I think my grandparents were a lot stricter with my parents than that.”

    Maybe this positive view of family life should not be unexpected. It is possible that the idea of teenage rebellion(反抗) is not rooted in real facts. A researcher comments, “Our surprise that teenagers say they get along well with their parents comes because of a brief period in our social history when teenagers were regarded as different beings. But that idea of rebelling and breaking away from their parents really only happened during that one time in the 1960s when everyone rebelled. The normal situation throughout history has been a smooth change from helping out with the family business to taking it over. ”

The Scar of Love

    Some years ago on a hot summer day in south Florida a little boy decided to go for a swim in the old swimming hole behind his house.In a hurry to dive into the cool water,he ran out of the back door,leaving behind shoes,socks and shirt as he went.He flew into the water,not realizing that as he swam toward the middle or the lake,an alligator（短嘴鳄）was getting close.The mother in the house was looking out of the window and saw the two as they got closer and closer together.In great fear,she ran toward the water,yelling to her son as loudly as she could.Hearing her voice,the little boy became alarmed and made a U—turn to swim to his mother.It was too late.Just as he reached her, the alligator reached him.From the dock,the mother grabbed her little boy by the arms just as the alligator snatched（抓住）his legs.That began an unbelievable tug-of-war（拔河比赛）between the two.The alligator was much stronger than the mother,but the mother was much too passionate to let go.A farmer happened to drive by,heard their screams;rushed from his truck,took aim and shot the alligator.

    Remarkably,after weeks and weeks in the hospital,the little boy survived.His legs were extremely scarred by the terrible attack of the animal.And on his arms,were deep scratches where his mother's fingernails dug into his flesh in her effort to hang on to the son she loved.

    The newspaper reporter,who interviewed the boy after the trauma（外伤）,asked if he would show him his scars. The boy lifted the pant legs.And then,with obvious pride,he said to the reporter,"Look at my arms.I have great scars on my arms,too.I have them because my mum wouldn't let go."

    You and I can identify with（认同）that little boy.We have scars,too.Not from an alligator,but the scars of a painful past.Some of those scars are unsightly and have caused us deep regret.But,some wounds,my friends,are because we have refused to let go.

    Will there be a time in our lives when cars don't crash? When we can just sit back and relax and our cars will drive themselves. Auto technology experts say “yes”. And they say that some of those advances may happen quicker than you might think.

    They will require the users to input the name of the destination or the complete address of the location that they want to go and the cars' artificial intelligence takes them there automatically without a driver. They will run on solar power in the daytime and ethanol fuel (乙醇燃料) at night. Toyota, BMW and Honda will completely control the trade of driverless car business together and will have the cheapest driverless cars. Fossil fuels will be completely incompatible (不相配的) with these cars.

    Driverless cars will not require a driver's license of any grade to operate. Anyone with basic literacy and computer skills who are at least 16 years of age will be legally allowed to operate the vehicle with absolutely no limits.This would give the young users permission to operate the driverless cars on major highways as well as secondary roads without needing a separate classification. In addition to all this, drunken people will be able to use their own automobiles to return home because they are not “driving”, the vehicle.

    What's more, car insurance will become obsolete(淘汰的) because there will be no more automobile accidents after the year 2025. This is because the driverless car will have all safety methods in place by the car's artificial intelligence to prevent automobile accidents. Global positioning systems will become mandatory (强制的) in all newly-produced cars after 2010, and will be the most important part in the driverless car.

    For the brave in the army, being sent away from home is just part of the duty. However, it's never easy especially for those with children. So, when I found out I was going to stay in South Korea for a year, I was nervous about how my five children, particularly my eldest daughter Abigail, would take the news since it meant I wouldn't be home to see her graduate from high school.

    To my surprise, Abigail told me not to worry and even suggested we make the news known among family members. "We've been lucky you haven't had to be sent abroad yet. Anyway, we can get connected through the Internet. See me on your phone." Abigail said. She stepped into many of my roles when I was gone. I wanted to find a way to thank her and show her how proud I was of her. I started planning the special surprise when my request to return home a few weeks earlier to attend Abigail's graduation ceremony(典礼) was approved.

    When my time in South Korea finally came to an end, I flew home, and stayed in a hotel. On Abigail's graduation day, I hid in an office behind the stage waiting until I heard her name called. I just kept thinking "Don't cry. Don't trip in your heels. Don't fall over." At last! Abigail was up on stage. I slipped up behind her, whispered in her ear, and around she turned! "I was just thinking, like, 'You aren't supposed to be here. What? What? How?' It was the biggest shock... I'm pretty sure my dad made people he didn't even know cry. Emotional for everyone." Abigail cried.

    You know what followed: embraces, kisses, tears, laughs, flowers, wishes...; aren't they what a family have in store?

    Wilbur and Orville Wright were the two youngest sons of Bishop Milton Wright, Wilbur was born on a farm near Millville and Orville was born in August in the house the family would come to occupy for more than 40 years in Dayton.

    Orville would discover in later years that he and Wilbur's first interests in flight began when they were children, with powered rubber-band-helicopter toys that their father would bring home for them from trips around the country. Orville and Wilbur would build duplicates（复制品）of these toys and bounce them off the ceiling. They were just crazy about these things for the reasons that they did not yet understand.

    Both boys loved to solve problems that seemed difficult to others. The more difficult the problem was, the more they saw it as a challenge. Exploring the unknown was such a joy for then that Orville once said, "I can remember when Wilbur and I could hardly wait for the morning to come to get at something that interested us. That's happiness."

    Putting their gift to work, the boys entered the printing business soon after high school. Orville designed and then built a printing press（印刷机）for this enterprise. At first, they did contract printing for other people, and soon one of their customers during the early 1890s was Father Milton's church. They also tried the newspaper business, and although their two newspapers, the West Side News and The Evening Item were considered to be of high quality, Dayton already had daily newspapers, so the Wrights soon returned to contract printing.

    Branching out into other areas, they also opened a bicycle business. Bicycling was the fastest growing sport in the country at that time, and their repair shop soon led them into building bicycles of their own design, often with tools of their own construction, such as the lathe（车床）driven by a one-cylinder gasoline engine built by Orville. The bicycle shop would provide the livelihood（生计）that would allow them to carry out their experiments on airplanes.

    Two heads are better than one. After all, when trying to make decisions, it's good to have a second opinion. But what about a third, fourth — even twelfth? What group size is best for making decisions quickly? For ants, four to six heads surpass one and also outperform 12 or 24. That's what Sylvia Zamescu now reports.

    The 18-year-old senior at Catalina Foothills High School in Tucson, Arizona isn't generally into ants. She's interested in decision-making, especially by people. Last summer, Sylvia read that social insects such as ants and bees can be used to model decision-making. Ants, for example, forage for food. When an ant finds it, it takes a bite and heads back to the nest. On the way; the ant leaves a scented trail for other ants to pick up. Back at the nest, the ant vomits up its meal into the mouth of other ants. Those nest-mates then decide with the first ant whether the food is good enough to deserve a trip back for more. If it is, they follow the first ant's scented trail to lunch.

    When there are too few ants, it could take a long time for one ant to spread the word. If there are too many, it's hard to "tell" each about the find. What's the right number for foraging success? Sylvia decided to find out. She contacted professors at the University of Arizona in Tucson to look for someone who would let her study decision-making by ants in their lab. Professor Wulfila Gronenberg answered her email.

    Working with one of Wulfila's graduate students Sylvia set up an experiment. She tested the behavior of one, two, four, six, twelve and twenty-four ants. Each group was placed in a large box al taped "starting line". At the other end of the box were two bricks of sweetened gelatin (动物胶) one contained only 3 per cent sugar, and the other 30 per cent. Sylvia timed how long it took each group of ants to find the food. She also measured how much time they spent around each sweet treat.

    When there were just one or two ants, the discovery was slow. The same was true when she set twelve or twenty-four ants loose. But four to six ants? Perfect! These medium-size groups found the food forest. They also figured out quickly that the sweeter food was better.

    Similar work has been done on bighorn sheep, fish and fruit flies. "It may not be four to six animals, but it's the same principle," Sylvia says. A medium-size group "is optimal". So when faced with a new decision, two heads are better than one. But too many heads are too much. Like the ants, a good decision may just require a happy medium.