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What do Leonardo da Vinci. Paul McCartney. Napoleon. and John McEnroe have in common? They are all left-handed. Today, about 15 percent of the population arc if handed. But why are peopleleft handed? The answer is the way the brain works. The brain has two halves-the right half and the left hail. The right half controls the left side of the body, and the left controls the right side of the body. So right-handed people have a strong left brain, and left-handed people have a strong right brain. The two halves the brain are about the same size. But each side controls different things. The left side controls language, math and logic. When you memorize the spelling of words, or when you put things in order, you use your left side. The right side of the brain controls you love of art, color and music, It is also good at recognizing faces. This does not mean, that all artists are left-landed and accountants (會計) arc right handed. There arc many exceptions (例外).Some right-handers have a strong right- brain, and some left brain have astrong left brain.