Two recent studies have found that punishment is not the best way to influence behavior.

    One showed that adults are much more cooperative if they work in a system based on rewards. Researchers at Harvard University in the United States and the Stockholm School of Economics in Sweden did the study.

    They had about two hundred college students play a version of the game known as the Prisoner's Dilemma. The game is based on the tension between the interests of an individual and a group. The students played in groups of four. Each player could win points for the group, so they would all gain equally. But each player could also reward or punish each of the other three players. Harvard researcher David Rand says the most successful behavior proved to be cooperation. The groups that rewarded the most earned about twice as much in the game as the groups that rewarded the least. And the more a group punished itself, the lower its earnings. The study appeared last month in the journal Science.

    The other study involved children. It was presented last month in California at a conference on violence and abuse（虐待）. Researchers used intelligence tests given to two groups. More than eight hundred children were aged two to four the first time they were tested. More than seven hundred children were aged five to nine. The two groups were retested four years later, and the study compared the results with the first test. Both groups contained children whose parents used physical punishment and children whose parents did not.

    The study says the IQs of the younger children who were not spanked were five points higher than those who were. In the older group, the difference was almost three points. The more they are spanked, the slower their mental development.

C

    The animal kingdom lost a beloved friend when poachers（偷猎者）in Kenya killed the world famous elephant named Satao solely for his ivory（象牙）, experts say.

    Satao was considered by some to be the largest and oldest elephant left in Africa. His tusks having grown long enough to reach the ground. Wandering around Kenya's Tsavo National Park, he was easily recognizable（可辨认的）by staff and visitors. Sadly, despite conservation efforts, he was killed on May 30, his body identified by park staff on June 2. His head was severely damaged and there were two holes left where his great tusks had

    “There is no doubt that Satao is dead, killed by an ivory poacher's poisoned arrow to feed the seemingly greedy demand for ivory in far off countries,” wrote Richard Moller of The Tsavo Trust. “A great life lost so that someone far away can have a trinket（饰品）.

    Satao isn't the first elephant—and far from the last—to pay the ivory price. Just last month, Mountain Bull, another Kenyan elephant, was killed by poachers.

    Kenya Wildlife Service（KWS）says 97 elephants and 20 rhinos have been killed this year, but others say the real numbers are much higher.

    The national park in which Satao lived is roughly 386 square miles—a massive land for already thinly-stretched resources to cover. Reports indicate that Satao had started to migrate towards the park's border-areas known by conservationists（野生保护人士）to be highly active for poaching.

    In the late 1960s, more than 275,000 elephants lived in Kenya. Now, that number has dropped to around 38,000, and continues to fall fast.

    “If Satao's death can cause the focus on what's actually happening here in terms of poaching, then he won't have died in vain,” said nature documentarian Mark Decble, according to The Dodo.

    I am a strong believer that if a child is raised with approval, he learns to love himself and will be successful in his own way.

    Several weeks ago, I was doing homework with my son in the third grade and he kept standing up from his chair. I kept asking him to sit down, telling him that he would concentrate better. He sat but seconds later, as if he didn't even notice he was doing it, he got up again. I was getting annoyed, but then it hit me: I started noticing his answers were much quicker and right when he stood up. Could he be focused while standing up?

    This made me start questioning myself and what I had been raised to believe. I was raised to believe that a quiet child was more likely to succeed. This child would have the discipline to study hard, get good grades and become someone important in life. Kids that were active and loud would only be objects of stares.

    Now people perhaps come to realize that their kids are born with their own sets of DNA and personality features, and all they can do is loving and accepting them. As parents, throughout their growing years and beyond that, we need to be our kids' best cheerleaders, guiding them and helping them find their way.

    I have stopped asking my son to sit down and concentrate. Obviously, he is concentrating, just in his own way and not mine. We need to accept our kids and their ways of doing things. This way may have worked for me but doesn't mean we need to carry it through generations. There is nothing sweeter than seeing our children being individuals. It makes us happy and that's just the way I want my kids to live life.

    Whenever something looks interesting or beautiful, there's a natural impulse(冲动) to want to own and preserve it — which means, in this day and age, that we're likely to reach for our phones to take a picture.

    Though this would seem to be an ideal solution, there are two big problems associated with taking pictures. Firstly, we're likely to be so busy taking the pictures that we forget to look at the world whose beauty and interest drove us to take a photograph in the first place. And secondly, because we feel the pictures are safely stored on our phones, we never get around to looking at them, so sure are we that we'll get around to it one day.

    These problems were noticed right at the beginning of the history of photography, when the average camera was the size of a grandfather clock. The first person to notice them was the English art critic, John Ruskin. He was a traveler who realized that most tourists make a boring job of noticing or remembering the beautiful things they see. He argued that humans have a natural tendency to respond to beauty and wish to have it, but that there are better and worse expressions of this desire. At worst, we get into buying souvenirs or taking photographs. But, in Ruskin's eyes, there's one thing we should do and that is attempt to draw the interesting things we see, no matter whether we have any talent for doing so.

    Ruskin was very upset by how seldom people notice details. He strongly disliked the travelers who prided themselves on covering Europe in a week by train. "If he be truly a man, no harm to go slow; for his glory is not at all in going, but in being."

Tuesday, 1^st September

    I had mixed feelings today, nervous, worried, happy, excited… My heart went down when Miss Chan, our head teacher, said that Matthew and Beth, two students from England, would spend three months with us! I was worried that I had to speak English so much! But at the end of the school day, I was happier than I thought: the morning with them today was more enjoyable than I expected.

    Today is the most unforgettable first day I have had! Matthew is fantastic! His English is clearer and easier to listen to than I thought. The other English student, Beth, is the most helpful girl I've ever met. There were lots of things to do on the first day. Beth offered to help Miss Chan put up all the notices. Of course, some of the credit (功劳) should also go to ME because I translated some of the notices for her. Miss Chan praised us!

    We finished all the preparations 10 minutes earlier than expected, then Beth and I talked for a while, Matthew sang several English songs and did some stand-up comedy (单人喜剧表演) at the party. We all praised him. When the bell rang to end the first school day, none of us wanted to leave.

    When I went back home, I had a little headache. I have probably spoken more English today than the whole of last year.

    It was really a happy day! I hope our friendship can continue, even after they gone back to England!

    People have been wondering why elephants do not develop cancer even though they have lifespans (寿命) that are similar to humans, jiving for around 50 to 70 years.

    Now scientists believe they know why. A team at the University of Chicago, US has found that elephants carry a large number of genes that stop tumors (肿瘤) developing. To be precise, they found 20 copies of an anti-tumor gene called TP53 in elephants. Most other species, including humans, only carry one copy.

    According to the research, the extra copies of the gene improved the animal's sensitivity to DNA damage, which lets the cells quickly kill themselves when damaged before they can go on to form deadly tumors.

    "An increased risk of developing cancer has stood in the way of the evolution of large body sizes in many animals," the study author Dr Vincent Lynch told The Guardian. If every living cell has the same chance of becoming cancerous (癌变的), large creatures with a long lifespan like whales and elephants should have a greater risk of developing cancer than humans and mice. But across species, the risk of cancer does not show a connection with body mass.

    This phenomenon was found by Oxford University scientist Richard Peto in the 1970s and later named "Peto's paradox (悖论)”". Biologists believe it results from larger animals using protection that many smaller animals do not. In the elephant's case, the making of TP53 is nature's way of keeping this species alive.

    The study also found that when the same genes were brought to life in mice, they had the same cancer resistance as elephants. This means researchers could use the discovery to develop new treatments that can help stop cancers spreading or even developing in the first place.

    "Nature has already figured out how to prevent cancer," said Joshua Schiffman, a biologist at the School of Medicine, University of Utah, US. "It's up to us to learn how different animals deal with the problem so that we can use those strategies to prevent cancer in people."