In 50 years of traveling, Colin McCorpuodale has visited every country in the world except three. And everywhere he goes, he sends himself a postcard. He always chooses a postcard with beautiful scenery (风景). Usually he writes just a short message to himself. However, he wrote an interesting story on his latest one, from the Malians Island.

Mr. McCorpuodale lives in London. On one of the walls in his room, you can see a large map of the world. There are hundreds of little red pins (大头针) stuck in it. “These pins mean a lot to me.” says Mr. McCorpuodale, “I follow the rule. I'm allowed to stick one in only if I've been in a place for more than 24 hours.”

Naturally, Mr. McCorpuodale has his favorite places. New Zealand, he describes as “a wonderful country”. About China, he says, “This is the country in the world which is completely different. There is no European influence. ”

Wherever he goes, Mr. McCorpuodale takes with him a photo of his wife, a candle, a shirt with a secret pocket and a pen.

So why does he do it? For the postcards or the travels? Mr. McCorpuodale laughs, “Neither. Only for the meaningful life.”

    When your dream is to become a footballer and play for Barcelona, nothing should get in your way — even if you have no feet.

    An 11-year-old schoolboy Gabriel Muniz, who was born without feet, will fly from his home in Brazil to take part in the Spanish club's summer training camp. Although he is disabled, Muniz is one of the top players at the school and captain of his gym class. He can run, dribble (运球), pass and strike the ball as well as any of his able-bodied teammates. He spends all his spare time on the football pitch.

    His best friend Lucas Santos spoke about his abilities on a video for The Sun, “He is skillful, he goes after it, he is fearless and he knows how to organize plays. He also makes good passes.” Mum Sandra was thrilled that her son would achieve his dreams. She said, “He started walking before he was one. We would go after him, expecting him to keep falling, but he never fell.” Muniz's gym teacher added, “He is challenging the social norms (标准). When he arrived there, no one believed in him.” But he showed to everyone that he could play as well as any other boy. So he was invited to go to Spain to show his talent.

    The Spanish La Liga soccer club has offered to fly Muniz to Spain in September, where he'll be able to show off his “fancy footwork” and meet his idol, Barça soccer player Lionel Messi.

    Muniz wears a prosthetic (假体的) ankle and foot to help him get around in rainy weather. He knows that his disability means he'll never be able to play for a professional football team and so Muniz is hoping that football will one day become a Paralympic (残奥会的) sport.

    It seems very natural that if you have two dollars and add two dollars to them, you have four dollars. But do you know it too men millions of years to be able to think so? In fact, one of the most difficult things to teach children is the idea of numbers.

    In ancient times, when a man wanted to tell how many animals he owned. he had no system(系统) of numbers to use. He put a stone into a bag for each animal. The more animals, the more stones he had. It may explain why the word "calculate" comes from the Latin word "calculus", "calculus" means "stone."

    Then, man used lines to count. People would just draw a line for each thing they wanted to count, but they had no word to tell the number.

    Later on, people used fingers. Again we have word that goes back to this. The word "digit" comes from the Latin word "digitus". It means "finger"! And the fact that we have 10 fingers led to the use of 10 in the system of numbers.

    The number system we use today was invented by the Hindus in India thousands of years ago and was brought to Europe during 8^th to 11^th by Arab traders(商人). In this system, people count things with ten numbers. 1. 2.3.4.5.6.7.8.9.and 0. It is decimal system(十进制), that is, it is built on the base of 10.