Are you left-handed? If you are you make up just 10 percent of the world’s population. 41 Most people write and play musical instruments with their right hands. Why are so few people left-handed? A new theory called “cooperation (合作) vs petition” may have the answer. 42 When making tools for a right-handed person — like a knife — it was easier if everybody could use the same hand. But some humans wanted to pete instead. So to have an advantage over right-handed people they would use their left hand to surprise petitors. __43 German born American scientist Albert Einstein British physicist Isaac Newton and British biologist Charles Darwin are some famous “lefties”. At least six US presidents were left-handed including Barack Obama Bill Clinton and Harry Truman. “Lefties” are also often linked with creativity and visual (视觉) skills. How can this be? Well the left side of our brain is where we solve problems. The right side of our brain is where we develop creativity. Right-handers tend to use the left side more than the right side. 44 “This is why there are more of them in creative areas such as music art and writing ” said Alan Searleman PhD from St. Lawrence University New York. __45__.They tend to have worse memories often forgetting names and places. A. While the body is symmetrical(对称的)in many ways in some key areas it’s decidedly one-sided. B. As humans evolved(进化) we needed to work together to live. C. This means we live in a right-handed world. D. However it’s not all good news for left-handers. E. Which means that lefties should celebrate their differences. F. Yet left-handers tend to use both sides more evenly(均匀)than right-handers. G. Although there are few left-handed people some of them are geniuses(天才).英语
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