About 90% of the population in the world is right-handed, But according to a report, lots of famous people are left-handed. For example, American presidents such as George H. W. Bush, Bill Clinton and Barack Obama are left-handed. So are Leonardo da Vinci , Bill Gates, Seven Jobs and so on. What does that mean? Are left-handed people smarter than the right-handed?
To answer this question, scientists studied 2,300 right-handed and left-handed students between the ages 6 and 17 in Italy. The students were asked to work out some math problems. There was no difference when they looked at the easier math problems. But left-handed students did better at the more difficult problems.
In fact, left-handedness has not always been seen in such a positive way. In the pamphlet(小册子) The Prevention and Correction of left-handedness in children written by J.W. Conway in 1936, left-handedness was described as a serious " lillness".
Prejudices(偏见)against left-handed people are built into our language. To be someone's " right-hand man" is good. It means you are a person who can help a lot.
But having "two left feet" or receiving a " left-handed compliment(赞扬)" is bad. The word itself comes from the old English. "lyft" mean weak or broken. These prejudices not only appear in English. The French word for left is "gauche" which means "awkward(笨拙的)"， while "droite", the French word for right , means "clever".
About 10% of humans worldwide are left-handed.
Most of US presidents are left-handed.
About 10% of rich men worldwide are left-handed.
Most of famous people are left-handed.
