Humans have launched themselves into the outer space. They've landed on the moon. They've built habitable space stations that orbit the Earth. The next giant leap for mankind is to reach another planet – specifically, Mars.

    The problem is that it's no easy task. The planet is 586 times further away from the Earth than the moon, and it'll take around 180 to 220 days to reach Mars, depending on where each planet is in its orbit. Such long periods in space have suggested many potential health problems, including hormonal changes, skin conditions, and muscle and bone deterioration (损耗).

    Here's where some furry friends come in. A wide range of animals have been in space, from fruit flies and spiders to cats, and dogs. Such experiments began as far back as the late 1940s in first tests to see if living things could withstand the extreme g-force (重力) of a rocket launch.

    Mice continue to play a very important part in space experiments, mainly because the animals make excellent test subjects. They're small, which makes them inexpensive and easy to care for. In addition, their size and short life span make it possible to do the equivalent of several human years of tests in a much shorter time. Finally, because mice are mammals, they share many common characteristics with humans in terms of genetics, biology and behavior.

    Astromice have hit the headlines recently, as a team of scientists led by Betty Nusgens, professor of biology at the University of Liege in Belgium, found that the mice suffered a 15 percent thinning of their skin after 91 days aboard the International Space Station (ISS).

    This experiment was part of a wider NASA mission (任务) called the Mice Drawer System (MDS). The Italian Space Agency developed the facility, which allows six mice to be housed, monitored, and automatically fed and watered aboard the ISS, among which three survived during the mission.

    The mice have participated in 20 separate experiments, to study such effects as osteoporosis (骨质疏松症), anemia (贫血) and heart health.

    Results for the 20 experiments are coming in gradually. But it's clear that mice continue to play an important role in the ongoing quest to conquer the final frontier.

    Dreams can be familiar and strange, fantastical or boring, but some dreams might be connected to the mental processes that help us learn. No one knows for certain why people dream, but some dreams might be connected to the mental processes that help us learn. In a recent study, scientists found a connection between nap-time dreams and better memory in people who were learning a new skill.

    In the study, 99 college students between the ages of 18 and 30 each spent an hour on a computer, trying to get through a virtual maze(迷宫). The maze was difficult, and the study participants had to start in a different place each time they tried — making it even more difficult. They were also told to find a particular picture of a tree and remember where it was.

    For the first 90 minutes of a five-hour break, half of the participants stayed awake and half were told to take a short nap. Participants who stayed awake were asked to describe their thoughts. Participants who took a nap were asked about their dream after sleep — and they were awakened within a minute of sleep to describe their dreams.

    Stickgold, a neuroscientist (神经科学家), to know what people were dreaming about when their eyes weren't moving, during sleep.

    Four of the 50 people who slept said their dreams were connected to the maze. Some dreamed about the music that had been playing when they were working; others said they dreamed about seeing people in the maze. When these four people tried the computer maze again, they were able to find the tree faster than before their naps.

    Stickgold suggests the dream itself doesn't help a person learn — it's the other way around. He suspects that the dream was caused by the brain processes associated with learning.

    All four of the people who dreamed about the task had done poorly the first time, which makes Stickgold wonder if the dreams show up when a person finds a new task particularly difficult. People who had other dreams, or people who didn't take a nap, didn't show the same improvement.

    People generally tend to pick out the best-looking fruits and vegetables when shopping for produce, but Canadian supermarket chain Loblaws is attracting customers with badly-shaped and faulty produce at the price of 30% lower than normal-looking ones.

    A trial run of the ugly food line, named “Naturally Imperfect”, began with only apples and tomatoes to choose from. Consumer demand has been so huge that Loblaws is going to introduce more unsightly vegetables and fruit options like onions and mushrooms. The line is available at other stores, including Real Canadian Superstore and Your Independent Grocer.

    All the produce that will be sold through Naturally Imperfect would otherwise have been used in juices, sauces, or soups, or have not been harvested at all. The director Dan Branson explained that this program benefited both food producers who would otherwise have to let abnormal harvest go to waste, and consumers who could buy fresh produce at low prices. And he was right, given how popular the line has become.

    “It really went well beyond our expectation,” Branson said. “I think it really spoke to the fact that Canadians are out there really looking for some options.”

    Of course, Canadians know that beauty is more than skin deep, but they also recognize that they can get the same flavor and nutritional benefits in spite of appearances. The positive response to the initial offering of apples and potatoes showed the opportunity to expand the line and offer more options at a greater price to Canadian families.

    “If you grow produce in your backyard, there will be a lot of produce that won't look as pretty as what you will see in a grocery store, said Branson. “And nature doesn't grow everything perfectly. I'd like to think if somebody were to take a No Name Naturally Imperfect apple, put right beside a No.l apple, close their eyes and eat them, there would be no difference.”

    One afternoon I toured an art museum while waiting for my husband to finish a business meeting.I was looking forward to a quiet view of the art works.

    A young couple viewing the paintings ahead of me chatted nonstop between themselves.I watched them a moment and decided the wife was doing all the talk.I admired the husband's patience for putting up with her continuous talk.Distracted by their noise,I moved on.

    I met with them several times as I moved through the different rooms of art.Each time I heard her constant burst of words,I moved away quickly.

    I was standing at the counter of the museum gift shop making a purchase when the couple came near to the exit.Before they left,the man reached into his pocket and pulled out a white object.He extended it into a long stick and then tapped his way into the coatroom to get his wife's jacket.

    “He's a brave man.”The clerk at the counter said,”Most of us would give up if wewere blinded at such a young age.During his recovery he made a promise that his life wouldn't change. So, as before,he and his wife come in whenever there's a new art show.”

    “But what does he get out of the art?”I asked,“He can't see.”

    “Can't see?You're wrong.He sees a lot.More than you or I do.”The clerk said,“His wife describes each painting so he can see it in his head.”

    I learned something about patience,courage and love that day.I saw the patience of a young wife describing paintings to a person without sight and the courage of a husband who would not allow blindness to change his life.And I saw the love shared by two people as I watched this couple walk away hand in hand.

    Suppose you work in a big firm and find English very important for your job because you often deal with foreign businessmen. Now you are looking for a place where you can improve your English, especially your spoken English. Here are some advertisements(广告) about English language training from newspapers. You may find the information you need.

    Global English Centre

    General English in all four skills: listening, speaking, reading, and writing.

    3-month (700 yuan), 6-month (1, 200 yuan) and one-year (2, 000 yuan) courses.

    Choice of morning or evening classes, 3 hours per day. Mon.~Fri.

    Experienced college English teachers.

    Close to city centre and bus stops.

    Tel: 67605272

    Add: 105 Zhongshan Road, 100082

    Modern Language School

    Special courses in English for business, travel, banking, hotel management and office skills.

    Small classes (12~16 students) on Sat. & Sun. from 2:00~5:00 p.m.

    Native English teachers from Canada and USA.

    Language lab and computers supplied.

    3-month course: 1,050 yuan; 6-month course: 1,850 yuan.

    Write or phone: Modern Language School, 675 Park Road, 100056

    Tel: 67353019

    The 21^st Century English Training Centre

    We specialize in effective teaching at all levels.

    We offer morning or afternoon classes, both of which last three months and a half at a cost of 800 yuan.

    We also have a six-week TOEFL preparation class during winter and summer holidays.

    Entrance exams: June 1 and Dec. 1.

    Only 15-minute walk from city centre.

    Call 67801642 for more information.

    The International House of English

    Three/Six-month English courses for students of all levels at a very low cost: 60 yuan for 12 hours per week, convenient (方便的) class hours:

    9:00~12:00 a.m. and 2:00~5:00 p.m.

    A four-month evening programme for developing speaking skills (same cost as day classes).

    Well-trained Chinese and foreign teachers with experience in teaching English as a second foreign language.

    Free sightseeing and social activities.

    Very close to the Central Park.

    For further information call 674322308.

    Still seeking a destination for your weekend break? There are some places which are probably a mere walk away from your college.

    King's Art Centre

    A day at the Centre could mean a visit to an exhibition of the work of one of the most interesting contemporary artists on show anywhere. This weekend tees the opening of an exhibition of four local artists.

    You could attend a class teaching you how to 'learn from the masters' or get more creative with paint—free of charge.

    The Centre also runs two life drawing classes for which there is a small fee.

    The Botanic Garden

    The Garden has over 8, 000 plant species; it holds the research and teaching collection of living plants for Cambridge University.

    The multi-branchedTorch Aloe here is impressive. The African plant produces red flowers above blue-green leaves, and is not one to miss.

    Get to the display house to seeDionaea muscipula, a plant more commonly known as the Venus Flytrap that feeds on insects and other small animals.

    The Garden is also a place for wildlife-enthusiasts. Look for grass snakes in the lake. A snake called 'Hissing Sid' is regularly seen lying in the heat of the warm sun.

    Byron's Pool

    Many stories surround Lord Byron's time as a student of Cambridge University, Arriving in 1805, he wrote a letter complaining that it was a place of "mess and drunkenness". However, it seems as though Byron did manage to pass the time pleasantly enough. I'm not just talking about the pet bear he kept in his roans. He spent a great deal of time walking in the village.

    It is also said that on occasion Byron swam naked by moonlight in the lake, which is now known as Byron's Pool. A couple of miles past Grantchester in the south Cambridgeshire countryside, the pool is surrounded by beautiful circular paths around the fields. The cries of invisible birds make the trip a lovely experience and on the way home you can drop into the village for afternoon tea. If you don't trust me, then perhaps you'll take it from Virginia Woolf—over a century after Byron, she reportedly took a trip to swim in the same pool.