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　　MEXICO CITY：A jetliner from the beach resort of Cancun was briefly hijacked as it landed in Mexico City on Wednesday．The hijackers released all passengers shortly before federal police stormed the plane, and the crew emerged unharmed moments later．

　　Police, who did not fire a single shot, led as many as eight handcuffed men away from the airplane, which was isolated at the end of a runway in an area designed for emergencies．The hijackers' motive was unclear, though Mexican news media initially identified them as Bolivians demanding to speak with Mexican President Felipe Calderon．

　　US, French and Mexican citizens were among the 112 passengers and crew on Aeromexico Flight 576, according to a US official who had been briefed on the situation．The official was not authorized to discuss the case and spoke on condition of anonymity．

　　Mexico's transportation and communications secretary, Juan Molinar, said there was no bomb on the airplane, although some passengers said one of the hijackers held a package that resembled an explosive device, and a bomb squad(拆弹小组)was later seen near the airplane．

　　He did not immediately identify the hijackers or speculate on their motive．

　　“Various people who participated in the act have been detained and we are investigating, ”Molinar said．

　　The attorney general's office said it was opening an investigation into terrorism and kidnapping but did not specify how many people could be charged．

　　Mexican news media initially reported the hijackers were Bolivian, but Bolivia's ambassador to Mexico, Jorge Mancilla, said Mexican authorities had no evidence that was the case．Mancilla said sources told him they could be Colombian or Venezuelan．Several passengers told reporters they did not notice a non-Mexican accent．

　　Passenger Rocio Garcia told the Televisa network that the pilot made an announcement after landing in Mexico City that the airplane was being hijacked．Passengers said the hijackers never communicated with them directly．

　　“These were scary moments, ”she said．

　　She said she saw one of the hijackers whom she described as a well-dressed, older man．

　　“He looked fine, like a normal passenger, ”she said．

　　Passenger Daniel Hernandez said he saw a hijacker carrying a Bible．

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　　Perhaps you do not know it, but there is something wonderful at your fingertips．You can make people happier, healthier and more hard-working just by touching their arms or holding their hands．

　　Doctors say that body contact(接触)is a kind of medicine that can work wonders．When people are touched, the quantity of hemoglobin(血红蛋白)－a type of matter that produces the red color in blood increases greatly．This results in more oxygen(氧气)reaching every part of the body and the whole body benefits．In experiments, bottle-fed baby monkeys were separated from their mothers for the first ten days of life．They became sad and negative．Studies showed the baby monkeys were more probable to become ill than other babies that were allowed to stay with their mothers．

　　Human babies react(反应)in much the same way．Some years ago, a scientist noticed that some well-fed babies in a clean nursery(托儿所)became weak．Yet babies in another nursery were growing healthily, even though they ate less well and were not kept as clean．The reason, he concluded, was that they often had touches from nurses．

　　Experiments show that most people like being touched．And nearly all doctors believe touch helps to reduce patients' fear of treatment．Of course there is time when a touch is not welcome．But even if we don't like being touched, a smile can make us feel better．Smiling increases blood flow and starts the production of “happy brain” chemicals．

　　So let's have a big smile and don't forget to keep in touch．

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　　For much of the world, vegetarianism(素食主义)is largely a matter of economics：Meat costs a lot more than beans or rice, so meat becomes a special-occasion dish．Even where meat is more plentiful, it’s still used in control, and it often provides a side note to a meal rather than taking center stage．

　　In countries like the United States where meat is not as expensive, though, people choose to be vegetarians for reasons other than cost．Parental preferences(父母亲的偏爱), religious or other beliefs, and health problems are among the most common reasons for choosing to be a vegetarian．Many people choose a vegetarian diet out of concern over animal rights or the environment．And lots of people have more than one reason for choosing vegetarianism．

　　Different people follow different forms of vegetarianism．A true vegetarian eats no meat at all, including chicken and fish．A lactoovo(乳制品)vegetarian eats dairy products　and eggs, but keeps out meat, fish, and chicken．It follows, then, that a lacto(乳，乳汁)vegetarian eats dairy products but not eggs, and an ovo(蛋，鸡蛋)vegetarian eats eggs but not dairy products．

　　A stricter form of vegetarianism is veganism．Not only are eggs and dairy products excluded(排除)from a vegan diet, so are animal products like honey．Some macrobiotic(养生的)diets fall into the vegan category．Macrobiotic diets limit not only animal products but also refined(经过提炼的)and processed foods, foods with preservatives, and foods that contain caffeine or other stimulants(刺激物)．

　　Following a macrobiotic or vegan diet could lead to nutritional deficiencies(营养不足)in some people．Teens need to be sure their diets include enough nutrients to fuel growth, particularly protein and calcium(钙)．If you’re interested in following a vegan or macrobiotic diet it’s a good idea to talk to a registered dietitian(营养学家)．He or she can help you design meal plans that include enough nutrients．

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　　Satellites are an important part of our ordinary lives．For example, the information for weather forecasts is sent by satellite．Some satellites have cameras which take photographs of the Earth to show how clouds are moving．Satellites are also used to connect our international phone calls．

　　Computer connections of the World Wide Web and Internet also use satellites．Many of our TV programs come to US through satellites．Airplane pilots also sometimes use a satellite to help them find their exact location．

　　We use satellites to send television pictures from one part of the world to another．They are usually 35，880 kilometers above the equator．Sometimes we can see a satellite in the sky and it seems to stay in the same place．This is because it is moving around the world at 11，000 kilometers an hour－exactly the same speed that the earth rotates．A satellite must orbit the Earth with its antennae(天线)facing the earth．Sometimes, it moves away from its orbit，So there are little rockets on it which are used to put the satellite back in the right position．This usually happens about every five or six days．

　　Space is not empty! Every week, more and more satellites are sent into space to orbit the Earth．A satellite usually works for about 10-12 years．Satellites which are broken are sometimes repaired by astronauts or sometimes brought back to Earth to be repaired．Often，very old or broken satellites are left in space to orbit the Earth for a very long time．This is very serious because some satellites use nuclear power and they can crash into each other．

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　　As late as 1800, women’s only place was in the home．The idea of woman in the business world was unthinkable．Men were certain that no woman could do a good job outside her home．This was such a widely accepted idea that when the well-known Bronte sisters began writing books in 1864, they had to sign their books with men’s names instead．

　　Teaching was the first profession open to women soon after 1800．But even that was not an easy profession for women to enter because most schools and colleges were open only to men．Oberlin College in Ohio was the first college in America to accept women．

　　Hospital nursing became respectable work for women only after Nightingale became famous．Seeing that she was not only a nurse but also a rich and well-educated woman, people began to believe it was possible for women to nurse the sick and still be “ladies”．Miss Nightingale opened England’s first training school for nurse in 1860．

　　The invention of the typewriter in 1867 helped to bring women out of the home and into the business world．By 1900, thousands of women were working at real jobs in schools, hospitals and offices in both England and America．Some women even managed to become doctors or lawyers．The idea that women could work in the business world had been accepted．

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　　I first visited hutong as part of a tourist group several years ago．We rode on a trishaw(脚踏三轮车)with a guide explaining the history, architecture and lifestyle of the local inhabitants．

　　Having visited the "must-sees" of Beijing, like the Forbidden City, the Temple of Heaven, the Drum Tower and the Summer Palace, going into the hutong home of some famous ancient families gave the “Beijing experience” a human element．

　　My curiosity has sharpened over the years from reading about them at every opportunity．During the preparation for the Olympics I was eager to learn that some siheyuan courtyards in hutong were turned into accommodations(食宿)for visitors．I wished to stay in one someday．

　　Preparing for a recent trip to the capital, I eagerly sought one out．On my limited teacher’s salary, I settled on an affordable option, though I looked longingly at the more upscale courtyard accommodations．

　　As usual, I ended up having something closer to a true experience．A real family still lives in the courtyard, which is closer to the original．The rooms all opened into the central courtyard．Flowers were blooming, beans and peas were climbing up the bamboo fence, and the cat was napping in the sun．Every day after exploring the city, I'd hurry back to the hutong, take a quick shower and join the cat－snoozing(小睡)in a bamboo-made chair with a book ready nearby．

　　As the other guests came back we’d greet one another．There was a mother and young daughter from France, a guy from Canada, a mother and teenage daughter from the Netherlands, a teacher from England and several guests from various parts of China．

　　Coming and going through the narrow alleys(小巷)of the hutong, the residents would smile and give cheery “ni hao”(hello)．Laughing children were playing under the watchful eyes of the neighbors．I felt right at home in this friendly neighborhood．

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　　What makes a person a scientist? Does he have ways or tools of learning that are different from those of others? The answer is “no”．It isn’t the tools a scientist uses but how he uses these tools which make him a scientist．You will probably agree that knowing how to use a power is important to a carpenter．You will probably agree, too, that knowing how to investigation, how to discover information, is important to everyone．The scientist, however, goes one step further; he must be sure that he has a reasonable answer to his questions and that his answer he gets to many questions is into a large set of ideas about how the world works．

　　The scientist’s knowledge must be exact．There’s no room for half right or right just half the time．He must be as nearly right as the conditions permit．What works under one set of conditions at one time must work under the same conditions at other times．If the conditions are different, any changes the scientist observes in a demonstration(实证)must be explained by the changes in the conditions．This is one reason why investigations are important in science．Albert Einstein, who developed the Theory of Relativity, arrived at the theory through mathematics．The accuracy(正确性)of his mathematics was later tested through investigation．Einstein’s ideas were proved to be correct．A scientist uses many tools for measurements．Then the measurements are used to make mathematical calculations(计算)that may test his investigations

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　　LOS ANGELES(Reuters)－Onions make you cry, add flavor to food and are talked about a lot for their medicinal benefits．Now the vegetable has another use－powering up green energy．

　　A new system debuts on Friday that changes onion juice into electricity at Gills Onions, the largest fresh onion processor(加工机)in the United States．

　　The Oxnard, California-based company expects its new onion-fueled power to reduce its electric bill by ＄700, 000 a year and cut its annual greenhouse gas releasing by up to 30,000 tons．The happy ending to this green energy tale, however, generated another question：how to get rid of onion waste．“When we peel an onion, 35 to 40 percent of the onion comes off before we have a usable onion．That’s the top, tail and skins around the onion before you get to the meat,” said Steven Gill, co-owner of the 25-year-old company．

　　They used to take the waste to the fields for composting(堆肥)but that became a problem as it cost too much．Ten years ago, Gill started looking at technology for a solution．“We ended up destroying the skins as they come out of the plant and extracting all the juice, which is very high in sugars, and bacteria love it,” Gill said．

　　In the new system, bacteria produce methane gas(沼气)from the juice．The gas then goes to two 300 kilowatt fuel cells, creating enough power for 460 homes．The company expects to get 35 to 40 percent of its electricity from this new system．

　　The company invested ＄9．5 million in the project and will receive ＄2．7 million from Southern California Gas Co．, a regulated subsidiary of Sempra Energy, as part of a state program to encourage self-contained generation by businesses．In addition to cutting its electric bill, the company will save ＄400,000 in costs of taking the waste to the fields and expects pay-back in six years．

　　The onion grower now has a new goal：to be a zero-waste facility by 2013．

　　“We wanted to follow it all the way through and make the full circle,” Gill said．

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　　Judging from recent surveys, most experts in sleep behavior agree that there is virtually an epidemic(流行病)of sleepiness in the nation．“I can’t think of a single study that hasn’t found Americans getting less sleep than they ought to,” says Dr David．Even people who think they are sleeping enough would probably be better off with more rest．

　　The beginning of our sleep-deficit crisis can be traced back to the invention of the light bulb a century age．From diary entries and our personal accounts from the 18th and 19th centuries, sleep scientists have reached the conclusion that the average person used to sleep about 9．5 hours a night．“The best sleep habits once were forced on us, when we had nothing to do in the evening down on the farm, and it was dark．” By the 1950s and 1960s, the sleep schedule had been reduced dramatically, to between 7.5 and 8 hours, and most people had to wake to an alarm clock．“People cheat in their sleep, and they don’t even realize they’re doing it,” says Dr David．“They think they’re okay because they can get by on 6.5 hours, when they really need 7.5, 8 or even more to feel ideally energetic．”

　　Perhaps the most merciless robber of sleep, researchers say, is the complexity of the day．Whenever pressures from work, family, friends and community increase, many people consider sleep the least expensive item on their programme．“In our society, you’re considered dynamic if you say you need only 5.5 hours’ sleep．If you’ve got to get 8.5 hours, people think you lack drive and ambition．”

　　To determine the consequences of sleep-deficit, researchers have put subjects through a set of psychological and performance tests requiring them, for instance, to add columns of numbers or recall a passage read to them only minutes earlier．“We’ve found that if you’re in sleep-deficit, performance suffers,” says Dr David．“Short-term memory is weakened, as are abilities to make decisions and to concentrate．”

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　　Modern science suggests that a healthy lifestyle matters much to how long you can live and how well you live．Here are some tips for you to form a healthy lifestyle．

　　Keep a scientific diet．Keep in mind that sugar can be removed from our diet completely．Over intake of sugar is one of the main reasons for getting fat．Over intake of protein or fat and low intake of fiber can also lead to getting fat．We need only a few grams of protein every day to keep our body in order．Like rain to crops, not the more the better．

　　Be always in a good mood．There is a relationship between the mood and health．A good mood keeps you in high spirits．Thanks to the internet, we can enjoy and learn much without going out．Take a look at some online shops and pick up some bargains, enjoy music and movies and chat with some good friends．Just keep happy．

　　Enough sleep．Two studies show the reasons why teens and adults don’t have enough sleep．With teens, a major reason is mobile phone use; with adults, it’s work．Meanwhile, a third study of young children shows that a lack of sleep in early life may lead to serious problems in future．Everyone needs at least 8-hour sleep to recover from tiredness and the hurt caused by hard work in the daytime．

　　Proper exercise．Do exercise to keep away from fatness．Because of the quick pace of modern life, you don’t have time to do exercise every day, but at least three times a week and 45 minutes each time．

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