People around the world are superstitious about numbers; even those ancient Greeks believed that all numbers and their multiples had some mystical significance.

    Those numbers between 1 and 13 were in particular to have a powerful influence over the affairs of men.

    For example, it is commonly said that luck, good or bad, comes in threes; if an accident happens, two more of the same kind may be expected soon afterwards. The arrival of a letter will be followed by two others within a certain period.

    Another belief involving the number three has it that it is unlucky to light three cigarettes from the one match. If this happens, the bad luck that goes with the deed falls upon the person whose cigarette was the last to be lit. The ill-men linked to the lighting of three things from one match or candle goes back to at least the 17th century and probably earlier. It was believed that three candles alight at the same time would be sure to bring bad luck; one, two, or four, were permissible, but never just three.

    Seven was another significant number, usually regarded as a bringer of good luck. The ancient astrologers believed that the universe was governed by seven planets; students of Shakespeare will recall that the life of man was divided into seven ages. Seven horseshoes nailed to a house will protect it from all evil.

    Nine is usually thought of as a lucky number because it is the product of three times three. It was much used by the Anglo Saxons in their charms for healing.

    Another belief was that great changes occurred every 7th and 9th of a man's life. Consequently, the age of 63 (the product of nine and seven) was thought to be a very perilous time for him. If he survived his 63rd year he might hope to live to a ripe old age.

    Thirteen, as we well know, is regarded with great awe and fear. The common belief is that this derives from the fact that there were 13 people at Christ's Last Supper. This being the eve of his betrayal, it is not difficult to understand the significance given to the number by the early Christians.

    In more modern times 13 is an especially unlucky number of a dinner party, for example. Hotels will avoid numbering a floor the 13th; the progression is from 12 to 14, and no room is given the number 13. Many home owners will use 12 1/2 instead of 13 as their house number.

    Yet oddly enough, to be born on the 13th of the month is not regarded with any fear at all, which just shows how irrational we are in our superstitious beliefs.

    Almost every machine with moving parts has wheels, yet no one knows exactly when the first wheel was invented or what it was used for. We do know, however, that they existed over 5,500 years ago in ancient Asia.

    The oldest known transport wheel was discovered in 2002 in Slovenia. It is over 5,100 years old. Evidence suggests that wheels for transport didn't become popular for a while, though. This could be because animals did a perfectly good job of carrying farming tools and humans around.

    But it could also be because of a difficult situation. While wheels need to roll on smooth surfaces, roads with smooth surfaces weren't going to be constructed until there was plenty of demand for them. Eventually, road surfaces did become smoother, but this difficult situation appeared again a few centuries later. There had been no important changes in wheel and vehicle design before the arrival of modem road design.

    In the mid-1700s, a Frenchman came up with a new design of road—a base layer (层) of large stones covered with a thin layer of smaller stones. A Scotsman improved on this design in the 1820s and a strong, lasting road surface became a reality. At around the same lime, metal hubs (the central part of a wheel) came into being, followed by the pneumatic tyre(充气轮胎) in 1846. Alloy wheels were invented in 1967, sixty years after the appearance of tarmacked roads (柏油路). As wheel design took off, vehicles got faster and faster.

    Growing up in Wyoming,everyday life was an adventure—I spent my time camping,and exploring mountains. When I was little,my mom became the state's first female U.S. Marshall.I'll never forget how the local newspaper praised her for her success in a field that's traditionally run by men.Under her influence,I made up my mind to achieve something great.Now,I've become famous for sailing,a sport often considered "a man's world".

    Sailing is considered a hard-to-break-into sport.And,generally,there are only two ways to get into it—either through a strict sailing education that leads to experience or by growing up on the water and racing in the Olympics. Most of my teammates became professional sailors in one of these two ways but I skipped both.

    In the summer of 2008,I went to St.Croix through a college internship（实习）program focusing on educating locals about HIV and AIDs.There,I discovered my love for sailing.Then,SCA,a global hygiene（卫生保健）company, made the decision to support an all-female team,and when they began accepting applications,I knew it was the chance of a lifetime.I made it my task to become a part of the team.Even when it seemed like there were no positions left,I never gave up.

    After a stressful,two-year application process,I finally got the call.I moved to Lanzarote in the Canary Islands and began training with the team immediately.The process was physically,mentally and emotionally exhausting,but I finally achieved my goal.I sailed in the "Everest of sailing" with only six years' experience.Later,there was an all-female team competing,and I was lucky enough to be a part of it.

    As women,we need to approach our dreams as if we deserve to achieve them as much as men,because we do. There are plenty of professions,including sailing,in which women are absent or have a minor presence—but that's not because they shouldn't be there.We need to push the boundaries and focus on obtaining our goals and passions,no matter how unobtainable and challenging they may seem.

A hybrid electric vehicle (混合动力车) or HEV is a vehicle driven by the combination of petrol engine and electric motor. Terrence has been driving a HEV for five years. He really doesn't understand why more people aren't accepting them. "I probably spend about $ 7 a day on petrol," the taxi driver told news. com. au. In his previous conventional vehicle Terrence said he was spending up to $ 30 a day on petrol, meaning he saves almost $ 6000 every year.

The Toyota spokesman said this was quite a high saving and official tests estimate (估计) an average driver would only save about 33 percent off their current bill. This means a driver paying $ 30 a day on petrol would see their bill drop to about $ 20 using the hybrid. "A taxi driver that drives in built-up areas and spends little time on highways will notice a higher fuel saving," he said. "Low speeds allow the electric motors to be used more and the petrol engine used less."

While some people are skeptical about how reliable hybrids are, Terrence said he had never run out of power. His Camry cost about $ 34,000 and so after five years, it's nearly paid for itself. "For cab drivers, it's a real advantage because of the cost-effectiveness," he said. Terrence has no complaints about the car. "I love it, the calm and quietness of it, the simplicity of it—you just jump in and go. The maintenance（保养）is really low. But the only difficulty is finding someone to service the car as there are not many experienced mechanics（机修工）."

Terrence said it's "extraordinary" that more drivers aren't buying more hybrid electric vehicles and that governments are not encouraging this more. "I think people have a view that you have to plug it in, which is not true. A lack of information about the cars may be stopping people from taking the plunge. It's not promoted at all for the public to understand—it's simplifying the actual owning of a car—you don't have to do so many things to own it and run it, it's just so much simpler. Why wouldn't the government promote such a thing?"

    J.K. Rowling is the writer of Harry Potter, which is now one of the bestsellers in the world.

    J.K. Rowling was born in Bristol on July 31st, 1965. She has one sister who is two years younger than her. Both girls loved listening to their father reading bedtime stories to them. They especially loved stories about magical worlds. Rowling wrote her first story, called Rabbit, at the age of six.

    After she graduated from the university, Rowling worked as a translator in London. During this time, on a long train trip in the summer of 1990, the idea came to her of a boy who has magic but doesn't know it. In 1992 Rowling began to teach English. She lived with her baby daughter, Jessica, and spent much time finishing the first Harry Potter book for young readers. It appeared in June 1997. To her surprise, the book was greatly successful. The film came out in November 2001. Now Harry Potter series(系列) is popular with people of all ages and about 60 million books were sold in 200 countries.

    Why has the series been so successful? There are a few things. Many other magical stories take place in faraway lands or in past or future times. But Harry lives in modern England. He's also a very normal boy: polite, friendly, brave and clever. So when other children read about Harry, they can imagine being like him.

    J.K. Rowling is very happy with the success, and she is now busy finishing the whole series of seven books. She's writing full time and she's really enjoying life. She says she will go on living a normal life with her daughter and writing children's books.