Passage Five There are millions of left-handed people in the world. A number of them got together in 1975 to form an association called Left-handers International. The purpose of the organization is to fight discrimination (particularly to jobs) and to inform the public. They want everybody to understand the left-handers are neither “strange” nor sick nor erous. Many studies have been made recently about hand preference in humans. They have brought interesting results. It has been found, for instance, that many more men than women are left-handed; that all children use both hands about equally until they are three years old; and that hand preference is not clearly marked until age six. Above that age, most people not only favour one particular hand but also have a favourite eye, a favourite ear and foot. We know that the left side of the body is controlled by the right side of the brain, which seems that this particular half is the seat of emotions, imagination, and of the sense of space. And, indeed, lefties in seem to be more creative than the right-handers; they also seem to be more athletic and to do better in some professions which ---like sports----require a good sense of space. In a large school of architecture , it was found in 1977 that 29% of the professes and 23% of the graduating students were left-handed---while lefties represent less than 10% of the general population. Finally, left-handers may be more stubborn and impulsive( 冲动的) than right-handers. And they are more likely to suffer from problems such as stuttering( 口吃) and a difficulty in reading called dyslexia. The problems are more serious in left-handed persons who have been forced to favour their right hand. Doctors insist that one should never try to change a child’s hand preference. According to recent studies, when is hand preference formed