Passage 2 What do Leonardo da Vinci ( 达芬奇 ) and Albert Einstein have in common? They were both left-handed, along with other famous people including Pablo Picasso ( ). In fact, an estimated 11 percent of Americans and Europeans are left-handed. Most people around the world are right-handed. This fact also seems to have held true throughout history. In 1977, scientists studied works of art made at various time in history starting with cave drawings from 15,000 B.C. and ending with paintings from the 1950s. Most of the people shown in these works of art are right-handed, so scientists guessed that right-handedness has always been common. Many researchers claim to have found relationships between left-handedness and various physical and mental characteristics, such as blond hair, blue eyes, vegetarianism, and sleep difficulties. Other studies have found a higher-than-normal level of left-handed people in certain occupations, including professional baseball and tennis players, architects, lawyers, as well as prisoners. However, some of these connections are very weak, and others haven't been proven. What makes a person become right-handed rather than left-handed? As yet, no one really knows for sure. One simple idea suggests that people normally get right-handedness from their parents. Studies have found that two right-handed parents have only 9.5 percent chance of having a left-handed child, while two left-handed parents have a 26 percent chance of having a left-handed child. Another common theory is that left-handed people suffer mild brain damage during their birth. Whatever the reasons behind it, people's attitudes toward left-handedness have changed a lot over the years. Statistics show that although 13 percent of young people (10-12 years old) are left-handed, only 6 percent of the elderly are left-handed. Left-handed children used to be punished until they began using their right hand like other children, but today people who are left-handed are no longer looked down upon nor are they considered abnormal. For most people today either case is perfectly acceptable. There are even a number of shops now that specialize in selling products designed for left-handed people, such as left-handed scissors, can openers, guitars, and even a left-handed camera. Don't you think it's wonderful?