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.

    March, April and May are months full of festivals and events all over the world. Here are four wonderful festivals around the world that happen in spring. If you want to know more about them, please click here or visit http://www. buddhanet. net/festival, htm/.

SongKran—Thailand

Dates: 13th-15th, April

    In Thailand, people celebrate a festival called Songkran, when people head out to the streets with water guns to spray everyone who walks past.

Naghol—Vanuatu

Dates: Every Saturday from April to May

    Every year, villagers come together to celebrate the harvest of yams, an important part in the people's diet in Vanuatu. The festival is most famous for its “land diving ceremony”. During the ceremony men and boys dive to the ground from high wooden towers with only two thin vines (藤) attached to their ankles.

Cherry Blossom Viewing—Japan

Dates: The cherry blossom season is different from year to year depending on the weather forecast.

    The festival is well-known. Japanese celebrate the days when the flowers finally blossom. Only a few days later, the petals (花瓣) fall to the ground, like pink snowflakes. That means the traditional festival only lasts for several days. In Japan, almost everyone has picnics in the parks to view the flowers.

Sinhalese New Year—Sri Lanka

Dates: 13th or 14th, April

    Just like in many other countries in South or South East Asia, this is the time when the Sinhalese celebrate the traditional New Year, an ancient celebration which marks the end of the harvest season and is one of two times of the year when the sun is straight above Sri Lanka. There are a lot of delicious foods during the celebration.

    A billionaire has recently made one of the biggest charitable（慈善的）donations to a university in China's history. Chen Tianqiao donated $115 million to the California Institute of Technology (Caltech) to help advanced brain research. The donation will be spent deepening the understanding of how the brain works. Chen has been interested in brain research, believing it can shape the industries such as artificial intelligence and virtual reality. However, this huge donation has caused heated discussions among Chinese scholars and internet users alike.

    Many criticized him for choosing to give money to a foreign university rather than home institutes for brain research, which are developing fast and are on track to catch up with the US in just a few years. Rao Yi, a biologist at Peking University, even said the donation was a typical mistake.

    Others, however, support his choice. They believe Caltech is a more reasonable choice compared with Chinese research institutions. Caltech has a long history and has taken a leading position in biology, and therefore it produces more efficient results. In addition, the results of the research benefit not only the American people, but also the rest of the world.

    A similar controversial case started two years ago when Pan Shiyi, chairman of SOHO China, donated $15 million to Harvard University to help disadvantaged Chinese students.

    Many believe that China is still behind in the management and use of donated money, and that as a result, Chinese charity donators are looking abroad. In comparison, Western countries like the US, which have a long history of donating money, have well-developed systems that use money efficiently. They can also provide full access for donors who want to track the use of the money. To get more donations, Chinese universities should be braver and more honest. They need self-reflection, rather than envy.

    About ten men in every hundred suffer from color blindness in some way. Women are luckier; only about one in two hundred is affected in this matter. Perhaps, after all, it is safer to be driven by a woman!

    There are different forms of color blindness. In some cases a man may not be able to see deep red. He may think that red, orange and yellow are all shadows of green. Sometimes a person cannot tell the difference between blue and green. In rare cases an unlucky man may see everything in shades of green — a strange world indeed.

    Color blindness in human beings is a strange thing to explain. In a single eye there are millions of very small things called "cones". These help us to see in a bright light and to tell difference between colors. There are also millions of "rods", but these are used for seeing when it is near dark. They show us shape but no color.

    Some insects have favorite colors. Mosquitoes prefer blue to yellow. A red light will not attract insects, but a blue lamp will. In a similar way human beings also have favorite colors. Yet we are lucky. With the aid of the cones in our eyes we can see many beautiful colors by day, and with the aid of the rods we can see shapes at night. One day we may even learn more about the invisible colors around us.

    Researchers continue to show the power behind our sense of smell. Recent studies have found, among other things, that the smell of foods like pizza can cause uncontrollable anger in drivers on roads.

    The review explains that smell is unique in its effects on the brain. According to Conrad King, the researcher who carried out the review, “more than any other senses, the sense of smell goes through the logical part of the brain and acts on the systems concerned with feelings. This is why the smell of baking bread can destroy the best intentions of a dieter.”

    Smell, which dictates(决定) the unbelievable complexity of food tastes, has always been the least understood of our senses. Our noses are able to detect up to 10,000 distinct smells. Our ability to smell and taste this extremely large range of smells is controlled by something like 1,000 genes (基因), which make up an amazing 3% of the human genome. Researchers Richard Axel and Linda Buck were together awarded a Nobel Prize in 2004 for their ground-breaking research on the nature of this extraordinary sense. These two scientists were the first to describe the family of 1,000 olfactory (嗅觉) genes and to explain how our olfactory system works.

    According to one study in the research review, smelling fresh pizza or even the packaging of fast foods can be enough to make drivers feel impatient with other road users. They are then more likely to speed and experience uncontrollable anger on roads. The most reasonable explanation is that these can all make drivers feel hungry, and therefore desperate to satisfy their appetites.

    In contrast, the smells of peppermint and cinnamon were shown to improve concentration levels as well as reduce drivers' impatience. Similarly, the smells of lemon and coffee appeared to promote clear thinking and mental focus.

    However, the way genes regulate smell differs from person to person. A study by researchers in Israel has identified at least 50 olfactory genes which are switched on in some people and not in others. They believe this may explain why some of us love some smells and tastes while others hate them. The Israel researchers say their study shows that nearly every human being shows a different pattern of active and inactive smell-detecting receptors.

    Our plan was to drive into Cambridge, catch the 7:34 train to Liverpool Street Station, then to separate and meet again for lunch. We should have arrived at Liverpool at 9:19, but due to a typical London fog, the train had to move along so slowly that it was not until 10:30 that it got there. In spite of our late arrival, Joan, my wife's sister, decided that she would go to see the Crown Jewels in the Tower of London while we went shopping. It was only after her sister had disappeared into the fog that my wife realized that we hadn't decided where we should meet for lunch. Since I had our three tickets for the concert in my pocket, this was indeed a problem. There seemed to be nothing we could do except taking a taxi to the Tower of London, and try to find her there. Needless to say, we didn't find her.

    It was now one o'clock, and the concert began at 2:30. "Perhaps she will think of waiting outside the concert hall," suggested my wife hopefully. By this time the fog was so thick that road traffic had to stop, and the only way to get there was by underground railway. Hand in hand we felt our way along the road to where we thought the nearest station should be. An hour later we were still trying to find it. Just as I was about to lose my temper completely when we met a blind man tapping his way confidently through the fog. With his help we found Tower Hill tube station just fifty yards down the road.

    By now it was far too late even to try to get to the concert hall before the performance began at 2:30, so we decided to return to Cambridge. It took seven long hours instead of the usual two to make that journey. Nor were we able to get any food and drink on the train. Tired and hungry we finally reached home at ten, opening the door to the sound of the telephone bell. It was Joan; she had seen the Crown Jewels, had managed to get another ticket for concert, and had had a wonderful dinner at a restaurant near the hotel where she decided to stay for the night. Now she was ringing to discover whether we had had an equally successful day.