Last month I was lucky enough to have a chance to make a trip into space with my friend Li Yanping, an astronomer. We visited the moon in our spaceship!

    Before we left, Li Yanping explained to me that the force of gravity would change three times on our journey and that the first change would be the most powerful. Then we were off. As the rocket rose into the air, we were pushed back into our seats because we were trying to escape the pull of the earth's gravity. It was so hard that we could not say anything to each other. Gradually the weight lessened and I was able to talk to him. "Why is the spaceship not falling back to the earth? On the earth if I fall from a tree I will fall to the ground." I asked. "We are too far from the earth now to feel its pull, " he explained, "so we feel as if there is no gravity at all. When we get closer to the moon, we shall feel its gravity pulling us, but it will not be as strong a pull as the earth's. " I cheered up immediately and floated weightlessly around in our spaceship cabin watching the earth become smaller and the moon larger.

    When we got there, I wanted to explore immediately. "Come on," I said. "If you are right, my mass will be less than on the earth because the moon is smaller and I will be able to move more freely. I might even grow taller if I stay here long enough. I shall certainly weigh less!" I laughed and climbed down the steps from the spaceship. But when I tried to step forward, I found I was carried twice as far as on the earth and fell over. "Oh dear," I cried, "walking does need a bit of practice now that gravity has changed." After a while I got the hang of it and we began to enjoy ourselves.

    An Italian company has created the world's first underwater farm. The station named Nemo's Garden consists of five biospheres(生物圈) fixed to the bottom of the sea off the coast of Savona, Italy. They're being used to grow strawberries, beans, garlic, and lettuce.

    “The main target of this project is to create other sources of plant production in areas where environmental conditions make it difficult to grow crops through traditional farming, including lack of fresh water, fertile soil, and extreme temperature changes,'' said project spokesperson Luca Gamberini.

    The five biospheres, currently floating between depths of 18 and 36 feet, are constantly watched by Ocean Reef Group —— a diving equipment company——from a control center on dry land. According to various news reports, the plants are watered by drips of water on the inner walls of the biospheres. With a constant temperature of 79 degrees day and night, and humidity(湿度) at around 83 percent, the conditions are ideal for plants to grow well. The high amount of carbon dioxide also encourages growth.

    Ocean Reef president Sergio Gamberini said he came up with the idea of growing plants underwater during a summer vacation in Italy. In his own words, he wanted to do something that's different and to show the beauty of the ocean. After two years of failed attempts, they finally were able to get these five biospheres working. Their success may lay the foundation for a new form of crop production that can be done without harming the environment.

    In fact, the biosphere seems to be attracting wildlife. Octopuses(章鱼) and endangered seahorses are taking shelter under the structure, while crabs(螃蟹) are climbing up the anchors and into the greenhouses. None of the creatures have damaged the plants so far. “It's so kind of science-fiction to see these two different forms of life interact,” Gamberini said.

    The tough economy is bringing new shoppers to the secondhand market.Plato's Closet in Charlotte,NC is a private company,which mainly buys and sells used clothes.While Charlotte has outstanding secondhand stores offering high-end and graceful brands for women,most of their stock applies to adults.Plato's closet targets teens and those in their 20s.

    Plato's Closet,with stores in Matthews and the university area,sells clothes and accessories（装饰品）that are currently popular at about one third the retail（零售）prices.

    The two hottest brands,for buying and selling,are Hollister and Abercrombie & Fitch.Even though the offerings tend to be suitable for young people,there are a variety of shoppers at Plato's Closet of varying ages.Women in their 30s,40s,and older could easily find a purse,jacket or piece of jewelry they like.

    If you are selling

    Unlike higher-end resale stores which usually work on consignment（寄售）,Plato's Closet buys on the spot.

    Items can be gently used,but must be in very good condition.

    Clothes should be less than two years old and styles should be the same as those still being sold at the shopping center.

    There is no negotiation;prices are set company-wide.If what you sell amounts to $30 or less,they'll give you cash.More than that,you'll get a Visa cash card.

    Secondhand success

    Don't get discouraged if you can't find something on your first trip.Resale shops are always getting new lists of goods and change their styles with each season.

    Be sure to check each piece carefully before buying.

    Price comparison

    Jackets: New York & Company black blazer,$12; retail: $37.

    Pants: Express Editor-style pants,$12; retail: $69.90.

    Shoes: Nine West black peep-toe pumps,$12; retail: $89.

    Jewelry: Necklaces,$3-$5; retail: $18-$30.

    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.

The Power of Sound

The music of world-famous guitarist Gabriel Ayala can make you cheer or cry depending on the chords（弦）. As the winner of numerous musical honors, he said," I love the power of sound.

    He was also recently named Native American Music Awards Artist of the Year and he played at the inauguration（就职典礼）of President Barack Obama.

"My concerts are a journey for both my audiences and myself," he says. "Feelings and emotions are all over the board and I am the tool trying to convey those feelings, trying to paint a visual picture through chord changes. Sound conveys power, whether it's a well-performed craze or the wind blowing through the trees. Music isn't just a pretty melody also it's a visual performance that captures moments in life and puts them to music."

    Ayala also shares his gift with kids As a teacher with a master's degree he serves as an advocate（提倡者）for youth education by being a role model. He practices the philosophy of honoring elders, respecting women and loving children. He delivers a message lo youth that they can become whatever they dream of.

The music man has recently launched a non-profit foundation to work more closely with youngsters "I've been blessed in both my career and life and feel I need to give back to pay my respect and hanks for the gift I have owned and I can do that through music," he says.

    One of his experiences in giving back involved a high school class of some 200, which included a special needs group. I used my guitar as a tool to capture their interest and once I began playing, the whole behaviors of the class changed in a positive way. This was especially so for one of the disabled students whose hands would not allow him to even hold my costly guitar.

    When I put the valuable guitar in his lap and he started beating the heck out of it as hard as he could, there wasn't a dry eye in the house. That's the real reason I play music, not for fame or fortune but because music has the power to truly heal. The look on that boy's face was priceless.

    A large scale study has found a link between eating a diet based on organic food and having a reduced risk of cancer. If the new results are confirmed, promoting organic food consumption could be a promising preventative strategy against the disease, a team of researchers from several French institutions said.

    Among the environmental risks for cancer, there are growing concerns about exposure to different types of pesticides（杀虫剂） from farming. The impact of such chemicals on the human body is still not well understood but there are some indications that harmful effects can occur even at low concentrations.

    Meanwhile, pushed by environmental and health concerns, the organic food market continues to grow rapidly. Organic food is produced without the use of synthetic（合成的） fertilizers, pesticides, genetically modified organisms, and the use of veterinary（兽医的） medications.

    "Organic foods are less likely to contain pesticide remains than conventional foods, and studies have shown that an organic diet reduces exposure to certain pesticide," Julia Baudry, lead author of the study from the Centre of Research in Epidemiology and Statistics in France, told Newsweek.

    "In the general population, the primary route of exposure is diet, especially intake of conventionally grown fruits and vegetables. However, few studies have examined the association of organic food consumption with cancer risk."

    For the study, published in the journal JAMA Internal Medicine, a team of researchers examined data on the organic food consumption frequency and dietary intake of 68,946 French adults collected by an ongoing survey which began in 2009. They then followed up on these people at various points in the future.

    Participants reported how often （never, occasionally or most of the time） they consumed 16 types of organic foods including fruits, vegetables, soy﹣based products, dairy products, meat and fish, eggs, grains and legumes, bread and cereals, flour, vegetable oils and condiments, ready﹣to﹣eat meals, coffee, tea, and herbal tea, wine, biscuits, chocolate, sugar and so on.