Experiments under way in several labs aim to create beneficial types of genetically modified foods, including starchier potatoes and caffeine-free coffee beans. Genetic engineers are even trying to transfer genes from a cold-winter fish to make a frost-resistant tomato.

    A low-sugar GM strawberry now in the works might one day allow people with health problems such as diabetes (糖尿病) to enjoy the little delicious red fruits again. GM beans and grains rich in protein(蛋白质) might help people at risk of developing kwashiorkor. Kwashiorkor, a disease caused by severe lack of protein, is common in parts of the world where there are severe food shortages.

    Commenting on GM foods, Jonathon Jones, a British researcher, said: "The future benefits will be enormous（巨大的）, and the best is yet to come". To some people, GM foods are no different from unmodified foods. "A tomato is a tomato," said Brian Sansoni, an American food manufacturer.

    Critics of GM foods challenge Sansoni's opinion. They worry about the harm that GM crops might do to people, other animals, and plants.

    In a recent lab study conducted at Cornell University, scientists tested pollen(花粉) made by BT corn, which makes up one-fourth of the U.S. corn crop. The scientist dropped the pollen onto milkweed, a plant that is the only known food source of a butterfly caterpillar(毛虫). Within four days of feeding on the leaves, almost half of a test group of caterpillars died. "This is a warning bell." said Cornell researcher Linda Raynor.

    Some insects that are not killed by GM foods might find themselves made stronger. How so? The insecticides are used on the crops to kill the pests. But GM plants produce a continuous level of insecticide. Insects relying on those crops may develop resistance to the plants and they may also develop a resistance to the insecticide.

    At the forum on GM food held last year in Canada. GM crops that have been made resistant to the herbicide might crossbreed with wild plants, creating "superweeds" that could take over whole fields.

    So where do you stand? Should GM food be banned in the United States, as they are in parts of Europe? Or do their benefits outweigh（胜过） any of the risks they might carry?

    Buy One Give One

    Buy One Give One (BIG1) is a Singapore-based business and non-profit organization with a job to create a world full of giving. We help businesses around the world give back in meaningful ways so that they can create measurable and long-lasting influence. Since 2007, we have worked with more than 1,600 businesses creating more than 88 million giving activities.

    Our business allows consumers, who may feel disconnected from the problems of the developing world, to become involved in social problems while still purchasing (购买)tor themselves. For example, shoe brands like TOMS promise to donate one pair of shoes for every pair purchased. Soapbox gives soap to a needy child with every purchase. Watch company WeWood plants a tree every time you buy a watch. They have helped socially-conscious consumers purchase products and feel good about providing help to others.

    See what some of our members say about being a part of BIG1.

    *Karen Ormerod

    Every product purchased at our store influences the lives of disadvantaged people in the world. I had never imagined I would be operating a business that could change people's lives. We are making a real difference by just doing what normally do. It is a wonderful experience.

    *Ben Baker

    What a good way of giving resources to where they need to be giving people the gifts of giving, and adding value to organizations along the wav. We have already made 160,000 giving activities through BIGI. Giving has become a necessary part of our everyday business. It's truly brilliant.

    BIGI focuses on the influence of giving on people's lives rather than simply the amounts donated. Our programs stress giving habitually in order to create growing influence around the world. When you join the BIGI giving program, you create your own unique giving stories.

    We do hope you can become a member of us!

    Teens don't understand the big fuss (小题大做). As the first generation to grow up in a wired world they hardly know a time when computers weren't around, and they eagerly catch the chance to spend hours online, chatting with friends, so what?

    But researchers nationwide are increasingly worried that teens are becoming isolated, less skillful at person-to-per son relationships, and perhaps numb to the cheatings that are so much a part of the e-mail world. "And a teen's sense of self and values may be changed in a world where personal connections can be limitless," said Shetty Turkle.

    Another researcher, Robert Kraut, said he's worried about the "opportunity costs" of so much online time for youths. He found that teens who used computers, even just a few hours a week, showed increased signs of loneliness and social isolation. "Chatting online may be better than watching television, but it's worse than hanging out with real friends," he said.

    Today's teens, however, don't see anything strange in the fact that the computer takes up a central place in their social lives. "School is busy and full of pressure. There's almost no time to just hang out," said Parker Rice, 17 "Talking online is just to catch time."

    Teens say they feel good about what they say online or taking the lime to think about a reply. Some teens admit that asking someone for a date, or breaking up, can be easier in message form, though they don't want to do so. But they insist there's no harm.

    In 1921, long before the Walt Disney Company turned Pooh (维尼熊) into an international star of TV and films, Christopher Robin Milne was given a toy bear on his first birthday from his father, A.A. Milne, who bought the stuffed (填充的) animal from a store. The stuffed animal was named Edward Bear. Years later, Edward was named Winnie. From the time Christopher Robin Milne was a baby until he was about 8 years old, he would receive different stuffed animals.

    A.A. Milne was a famous English author. As he watched his son interact (互动) with Winnie and friends, A.A. Milne thought his child's interaction with the collection of animals would make a great bedtime story. So Milne worked with artist Ernest H. Shepard and wrote the first Winnie the Pooh poem, where Edward Bear was known as “Teddy Bear”. The writings appeared in Punch magazine and in the book they wrote together, When We Were Very Young, which was published in 1924. In a four-year period, three more books that centered on the bear and his team followed: 1926's Winnie-the-Pooh; 1927's Now We Are Six; and 1928's The House at Pooh Corner.

    The books and poems about Pooh brought great success to the author, and the characters became favorites with young children and their families around the world. Their popularity led Disney to get the rights to make films about the characters in 1961. Five years later, Pooh, Tigger, Piglet and the rest of the team appeared on screen for the first time in Winnie-the-Pooh and the Honey Tree. The characters later appeared in TV shows, movies, video games and short films. Pooh's most recent appearance came last year in the popular children's program, Doc McStuffins, where he was a special guest.

    Have you ever imagined what it would be like to see the world through an animal's eyes? For example, what a chimpanzee sees as it sits at the top of a tree, or a penguin's view as it dives into the sea to catch its dinner?

    These questions are answered in the nature documentary Animals with Cameras, produced by the BBC. The three-part series was first aired in the UK last month. To explore animal stories "told" by the animals themselves, the documentary's filmmakers worked with scientists to develop cameras that wild animals could wear.

    "Never before have we seen such high-quality footage (连续镜头)directly from the animal's point of view, " BBC Nature executive producer Fred Kaufman told PBS." This miniseries greatly expands our comprehension of animal behavior and this camera technology opens up new possibilities for discovering so much more."

    Indeed, the groundbreaking technology provides a new viewpoint of the animal kingdom. New cameras with enough battery life to shoot for hours at a time were designed to be comfortable enough for animals to wear, according to the documentary's camera designer Chris Watts.

    The technical challenges didn't stop there. Some animals were very curious about the equipment, with some even fighting each other for the chance to wear a camera. In the case of chimpanzees, "we had to create dummy (仿造的)cameras, so that every chimpanzee could get one", the miniseries' wildlife cameraman Gordon Buchanan told Live Science.

    For animals that were comfortable enough to be with human beings, the cameras could be fitted and removed by hand. But for others, the cameras came off automatically using a timed release and were collected afterward. This meant that the cameras needed to be as tough as possible.

    To avoid disturbing the animals, scientists who were good at dealing with wildlife came to help by putting the cameras on the animals." The last thing we want to do is cause them distress." the documentary's producer Dan Rees told the BBC. "To follow an animal in the first place, there had to be a clear benefit in terms of knowledge about it that might be useful to protecting a species in the future.

    Their efforts certainly paid off. " Footage that captures (捕捉)these rare and exciting glimpses of animals bidden habits is important to scientists, but documentaries like Animals with Cameras also resonate with (引起共鸣)audiences, connecting them with the beauty - and danger - of wildlife in their natural environments," Live Science noted.

    Everybody hates rats (big mice). But in the earthquake capitals of the world — Japan, Los Angeles, Turkey — rats will soon be man's best friends.

    What happens after an earthquake? We send in rescue dogs. Why? Because they can smell people. Dogs save lives. They help rescuers to find living people. But dogs are big and they can't get into small spaces. So now a new research project is using a smaller animal to save lives: the rat.

    How does it work? First, the rat is trained to smell people. When this happens, the rat's brain gives a signal (信号). This is sent to a small radio on its back, and then the rescuers follow the radio signals. When the rat's brain activity jumps, the rescuers know that someone is alive. The rat has smelled that person.

    Although there are already robots which can do this job, rats are better. Christian Linster at Cornell University, New York, says, "Robots' noses don't work well when there are other smells around. Rats are good at that." Rats can also see in the dark. They are cheaper and quicker to train than dogs, and unlike robots, they don't need electricity!

    The "rat project" is not finished, but Julie Ryan of International Rescue Organization in Scotland says, "It would be wonderful. A rat could get into spaces we couldn't get to, and a rat would get out if it wasn't safe." Perhaps for the first time in history, people will be happy to see a rat in a building (but only after an earthquake, of course).