The researchers created a long-termstudy in which they invited families in 16 school districts in central Pennsylvania to participate. In each family, a teenager, a younger sibling, their mother and their father were interviewed at home and then asked about their activities and self-worth five times over a period of seven years.

    The study authors were surprised to discover that when fathers spent more time alone with their teenagers, the kids reported they felt better about themselves. Something about the father's role in the family seemed to improve self-esteem among the teenagers in the study, said study author Susan McHale, a professor of human development at Pennsylvania State University.

  “Time spent with Dad often involves joking, teasing and other playful interactions. Fathers, as compared to mothers, were more involved in leisure activities and had more friend-like interactions with their children, which is crucial for youth social development,” the study showed.

    But Marta Flaum, a psychologist in Chappaqua , New York, said, “How these findings reflect the real world is areal question. The sample in the study is so small and so unrepresentative of more families in the country today that I'm not sure how much we cangeneralizing from it. In my community, in Westchester County, I don't see parents and teenagers spending much time together at all. Parents are often working so hard and have less time to be together with their kids.”

    However, Flaum encourages parents to make time for their kids no matter how much work they have to do. “Research like this reminds us of how important it is. The time we have with themis so short, ” she said.

    Forgive the accidental. A sudden fall is humorous not because we like to see people fall, but because it surprises. Froma spilled（溢出）water glass in a meeting to Aunt Rae's teeth coming off in the Thanksgiving turkey, the embarrassment of accidents can be relieved by humor and a helping hand. After making sure that nobody's hurt, forgive accidents with a chuckle（咯咯地笑）rather than a scolding.

    Look for the unexpected. The kid whoused to look at you with his eyes closed during a test had the idea. Parents who serve green eggs and ham to their children on graduation day get the idea. Unexpected actions lighten an atmosphere and relax people.

    Learn to laugh with your kids. Most of what children say and do is funny. Help them learn that accidents are sometimes funny and sometimes occasions for joining in and helping another human being. By sharing laughs and attempting to explain humor, you develop your sense of humor, as well as help kids develop their own sense of humor.

    My family lived in a motel for two years. Like most families living there, we stayed in a two- bedroom suite. We were living from paycheck to paycheck, so when Christmas approached, we didn't know if we could be able to purchase gifts for our children.

    A few days before Christmas someone dropped off presents for all the kids that lived in the motel. It brought so much joy to all the children, most of whom knew that they wouldn't be receiving anything.

Five years ago, we moved out of the motel. After that, my husband and I were working hard at the Joe's Crab Shack to support our family. A few days before Christmas, I was working a “big top” and a single table. The man at my table could see that the large table was taking most of my time, but I was very patient and friendly. Between drinks and food I was able to chat with him about his family and mine. He left me $10, then walked out. About 10 minutes later, I turned around and there he was again. He gave me a hug, and put something in the side of my coat, telling me “Have a Merry Christmas”. I reached into my coat and pulled out $800.

    I was so moved by his generosity that I burst into tears. He had given me more than enough money to help my family catch up on our bills. After discussing what we should do with the money we had left over, we decided to buy presents for the families living at the motel, so we could pass on the blessing that we had received. Since then, it has been a tradition for us to give Christmas gift to the families in need.

    Last year we were able to give presents each of the 80 children at a school in our community, and throw a Christmas party for them. This year our goal is to add at least 20 children.

    Many people believe that language belongs to human beings. However, cats have developed a language not for each other, but for the human beings who have them as pets.

    When communicating with each other, cats “talk” with a system of signals. Their tails, rather than any kind of “speech”, act as an important way to express themselves. They also touch each other to express s their feelings. With other cats, they will use their voices only to express pain. Unbelievable, all of that changes when a human walks into the room. Cats use many different kinds of vocal (声音的) expressions when they communicate with a person. Since these vocal expressions are not used to communicate with other cats, it seems that cats developed this “language” to communicate with their human owners.

    This fact is shown more clearly when watching rooms that have only one cat and those with several cats. An only cat is usually very vocal, since the only creature(动物)around with whom the cat can communicate is its owner. Cats with other cats, though, are much quieter. If they want to have a conversation, they only need go to other cats and communicate in their natural way.

    Since cats learned to meow(喵喵叫)for the only purpose of communicating with human owners should take the time to learn what their different meows mean. If an owner knows, to name just a few examples, which meow means the cat is hungry, which means the cat wants to be petted, and which means the cat wants to have a little “conversation”, the relationship between cat and owner will be closer.

    A new argument has been put forward as to whether penguins are disturbed by the presence of tourists in Antarctica.

    Previous research by scientists from Keil University in Germany monitored Adelie penguins and noted that the birds' heart rates increased dramatically at the sight of a human as far as 30 meters away. But new research using an artificial egg, which is equipped to measure heart rates, disputes this. Scientists from the Scott Polar Research Institute at Cambridge say that a slow moving human who does not approach the nest too closely, is not viewed as a threat by penguins.

    The earlier findings have been used to partly explain the 20 per cent drop in populations of certain types of penguins near tourist sites. However, tour operators have continued to insist that their activities do not adversely（不利地）affect wildlife in Antarctica, saying they encourage non-destructive behavior in tourists, and that the decline in penguin numbers is caused by other factors.

    Amanda Nimon of the Scott Polar Research Institute spent three southern hemisphere summers at Cuverville Island in Antarctica studying penguin behavior towards humans. “A nesting penguin will react very differently to a person rapidly and closely approaching the nest,” says Nimon. “First they exhibit large and prolonged heart rate changes and then they often flee the nest leaving it open for predators（掠夺者）to fly in and remove eggs or chicks.” The artificial egg, specially for the project, monitored both the parent who had been 'disturbed' when the egg was placed in the nest and the other parent as they both took it in turns to guard the nest.

    However, Boris Culik, who monitored the Adelie penguins, believes that Nimon's findings do not prove his own research invalid. He points out that species behave differently – and Nimon's work was with Gentoo penguins. Nimon and her colleagues believe that Culik's research was methodologically（方法论上）defective because the monitoring of penguins' responses needed catching the birds and fitting them with heart-rate transmitters（发射器）. Therefore, argues Nimon, it would not be surprising if they became stressed on seeing a human subsequently.

Gene technology to benefit people

    Among all the fast growing science and technology, the research of human genes, or biological engineering as people call it, is drawing more and more attention now. Sometimes it is a hot topic discussed by people.

    The greatest thing that gene technology can do is to cure serious diseases that doctors at present can almost do nothing with, such as cancer and heart disease. Every year, millions of people are murdered by these two killers. And to date, doctors have not found an effective way to cure them. But if the gene technology is applied, not only these two diseases can be cured completely, bringing happiness and more living days to the patients, but also the great amount of money people spend on curing their diseases can be saved, therefore it benefits the economy as well. In addition, human life span(寿命) can be prolonged.

    Gene technology can help people to give birth to more healthy and clever children. Some families, with the English imperial(皇室) family being a good example, have hereditary(遗传的) diseases. This means their children will for sure have the family disease, which is a great trouble for these families. In the past, doctors could do nothing about hereditary diseases. But gene technology can solve this problem perfectly. The scientist just need to find the wrong gene and correct it and a healthy child will be born.

    Some people are worrying that the gene research can be used to manufacture human beings in large quantities. In the past few years, scientists have succeeded in cloning a sheep; therefore these people predict that human babies would soon be cloned. But I believe cloned babies will not come out in large quantities, for most couples in the world can have babies in very normal way. Of course, the governments must take care to control gene technology.