Bamboo is one of the world's most useful plants. For thousands of years, bamboo has been used in many different ways-from food to medicine to clothing and, in small ways, as a building material.

    However, bamboo is not often used as a building material in the developed world. A professor at the University of Pittsburgh in Pennsylvania is trying to change that. The professor and his students are testing the strength of bamboo.They are testing how much pressure or weight it can take before breaking.

    Kent Harries is a professor at the University of Pittsburgh. Harries says that testing methods for bamboo need to be the same for all. They need to be standardized. Standardizing test methods for bamboo will help to bring the plant into common use. It will also give engineers and builders around the world a dependable standard.

    Harries says that bamboo is strong in nature. The strength of at least three species of bamboo is similar to steel.Besides its strength, bamboo has other features that make it very useful in building. He says it is resilient(有弹力的), meaning it keeps its shape and strength even under pressure.

    Bamboo also grows quickly. Bamboo that is suitable for construction needs much less resources than wood. The harvest cycle of bamboo is about 3 years. Softwoods such as cedar, pine and spruce have a harvest cycle of about 10 years. And hardwoods that come from flowering plants such as oak and walnut need more than 30 years.

    Bamboo is widely used as food for panda bears. It is also used for flooring and window covers. However, for building, bamboo is not used much outside its native growing area. This is mostly because of its round shape. But there are other reasons too. People think -- or have the mentality--that bamboo is a low quality building material.

    One of my all time favorite holiday destinations is the Gold Coast. With its beautiful beaches, mountain hinterland and theme parks, the variety from one location to another is fantastic! And it's also important that it's like a playground for my children.

    The Gold Coast certainly offers something for every member of our family. We all love heading down to the beach for an early morning swim or surf. The beaches feature some of the softest golden sand and pumping waves, making them ideal for surfing. Safety is important especially when I'm out with the kids, and I feel better knowing that lifeguards are continually on patrol（巡逻）. The long coast also offer the perfect setting for a leisurely walk at sunset-a favorite activity of mine.

    Then, of course, there's the bargain-hunting in the city's center. For shopping goers there are amazing shopping centers boutiques and the usual chain stores. I always pick up loads of goodies at Pacific Fair.

    The Gold Coast is popular for its theme parks-Sea World, Wamer Bros Movie World and Dream World. The seal and dolphin presentations at Sea World keep both children and adults on the edge of their seats as the sea creatures go through a series of complicated jumps, flips and rolls. It's great entertainment and an educational window to the underwater world for the kids. Our kids also enjoy meeting the characters at Movie World and watching how real movies are made.

    Night-time is equally fun, as we usually set off to find the best local restaurants and cafes. The mix of cultures and influences has given the Gold Coast a wide variety of choices, including modem Australian, Italian, Asian and seafood, although sometimes nothing beats fish and chips!

    A visit to the Gold Coast in the Sunshine State is worthwhile and fun.

    Running is often tiring and a lot of hard work, but nothing beats the feeling you get after finishing a long workout around the track.

    But while it's long been believed that endorphins (脑内啡）—chemicals in the body that cause happiness — are behind the so-called “runner's high”，a study suggested that there may be more to this phenomenon than we previously knew.

    According to a recent study published by a group of scientists from several German universities, a group of chemicals called endocannabinoids (内源性大麻素）may actually be responsible for this familiar great feeling.

    To test this theory, the scientists turned to mice.

    Both mice and humans release high levels of endorphins and endocannabinoids after exercise, along with many other chemicals. After exercising on running wheels, the mice seemed happy and relaxed and displayed no signs of anxiety.

    But after being given a drug to block their endorphins the change. However, when their endocannabinoids were block with a different drug, their runner's high symptoms seemed to fade.

    “The long-held notion of endorphins being responsible for the runner's high is false. Endorphins are effective pain relievers, but only when it comes to the pain in your body and muscles you feel after working out,”Patrick Lucas Austin wrote on science blog Lifchacker.

    Similar studies are yet to be carried out on humans, but it's already well known that exercise is a highly effective way to get rid of stress or anxiety.

    The UK's National Health Service even prescribes (开药方)exercise to patients who are suffering from depression.

    “Being depressed can leave you feeling low in energy, which might put you off being more active. Regular exercise can boost your mood if you have depression, and it's especially useful for people with mild to moderate (中等的）depression,” it wrote on its website.

    It seems like nothing can beat that feeling we get after a good workout, even if we don t fully understand where it comes from. At least if we're feeling down, we know that all we have to do is put on our running shoes.

    Young people can have problems with their minds. Some students become worried because they have to study very hard. Others have trouble getting on well with people like their parents and classmates.

    Li Wen, a junior 2student from No.2Middle School, could not understand his teacher and was doing badly in his lessons. He became so worried about it that he started to cut his finger with a knife. Another student16yearold Yang Fang from No.1Middle School, was afraid of exams. She got very worried in one and when she looked at the exam paper, she couldn't think of anything to write.

    A recent report from Jiefang Daily says about 18% of Shanghai teenagers have mental problems. Their troubles include being worried and very unhappy and having problems in learning and getting on with people. Many students who have problems won't go for advice or help. Some think they will look stupid if they go to see a doctor. Others don't want to talk about their secrets Liang Yuezhu, an expert on teenagers from Beijing Anding Hospital has the following advice for teenagers：

    Talk to your parents or teachers often.

    Take part in group activities and play sports.

    Go to see a doctor if you feel unhappy or unwell.

    When pups are between 2 and 3months old, their mothers will abandon them for any number of reasons. With no mother to watch out for them, infant (婴儿) mortality of pups under one year skyrockets (飞涨) to around 90%. So, only about 10% of motherless, homeless pups survive.

    Without mothers, how are these abandoned pups supposed to survive? For the study, researchers Clive Wynne at Arizona State, Nadine Chersini at Utecht University, and Nathan Hal at Texas Tech University brought in 51 college students and asked them to rate the attractiveness of headshots (头部特写) of puppies at different ages.

    The pups peaked at different ages, but they were all ranked likable between six to eight weeks, since newly abandoned pups are competing with each other for human heartstrings (怜悯), evolution says they should be most likable around 6 and 11 weeks. This is around the time they are weaned (断奶) and let go of by their mothers.

    There are a few characteristics that humans find particularly adorable across species: big, forward-facing eyes, floppy and unstable limbs (肢), and a soft, rounded body shape. We're also keen to scream when animals have large heads in comparison to their bodies, and this reaction goes back to evolution.

    Called kinderschema (婴儿萌), these qualities are also apparent in human babies and necessary for their survival. The characteristics activate the decision-making part of the brain to encourage you to protect and nurture the baby. At the same time, the brain's pleasure center releases dopamine (多巴胺). With these two reactions, your brain makes you want to protect the baby and rewards you for doing so. With your protection, the baby can survive.

High-Wire Act

    Mickey Wilson had been on the mountain only a few seconds when he heard the scream. Wilson, 28 years old, had just gotten off the cable car (索道缆车) at the Arapahoe Basin Ski Area in Keystone, Colorado, along with his friends Billy Simmons and Hans Mueller. Their friend Richard had been on the cable car ahead of them, but when the men reached the top of the lift, he had disappeared. The men walked toward the source of the scream and found skiers stopped on the slope, pointing to the cable car. And then the friends screamed too.

    "Oh, Richard!" yelled Mueller.

    When Richard had tried to jump off the cable car, his backpack had been caught in the chair, which then dragged him back down the hill. In the process, the backpack belt twisted around his neck, making him breathless. Now Richard's body was swinging four feet above the snow. The cable car operator had quickly stopped it, and the friends kicked off their skis and ran toward the scene. They made a human pyramid to try to reach Richard, but the unconscious man was too far off the ground. With the clock ticking, Wilson ran to the ladder of a nearby lift tower. Scared skiers watched as he struggled the 25 feet. After he reached the top, Wilson's first challenge was to climb onto the two-inch steel cable that held the chairs. He handled the balance and height bravely, but he knew he could not walk on the cable. Therefore, he calmed down and sat over it and then used his hands to pull himself to Richard quickly. Wilson's greatest fear wasn't that he'd fall, but that he wouldn't reach Richard. "This was life or death," he said.

    When he reached Richard's chair, Wilson swung a leg over the cable and attempted to drop down onto it. But as he did that, his jacket caught on the movable footrest, which was in the up position. The footrest began to slide down, with Wilson attached. But before that could happen, he managed to free himself and reached Richard.

    Fortunately, the ski patrol (巡查) had gathered below and performed emergency treatment on Richard, who had been hanging for about five minutes, then skied him down to an ambulance.

    That night, Richard called from the hospital to express his thanks to Wilson, his other friends and the workers at the Arapahoe Basin Ski Area.