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In the world, there are 10% to 20% of people are left-handers, even though they live in the middle of the most right-handers, they still cannot be neglected. However, what decide the tendency of using hand? And where are the left-handers in the end different from ordinary people? However, is left-hander congenital or acquired influence? To this day, the saying on the main cause of using hand tendency is still varied. Scientists each have their own say. With the rapid development of neurology, the asymmetry of brain function gradually is taken seriously, and the causes on the left-handed have cognitive change. Early widespread belief that the impact of early childhood results in a left-handed phenomenon; Later, this knowledge into the embryonic period has been affected. In 1970s and early 1980s, Harvard University neurologist Norman Gershwin published a theory, the theory was popular for many years, and now also has many supporters. He believes that if the mother's womb testosterone has too much, it may make the uterus within the embryonic brain and constructed to produce a subtle change, thereby enabling the fetus from right-handed to become left-handed. The number of left-handed male is a little more than the left-handed female, and this gender difference seems to be the influence of testosterone secretion. Gershwin and other scholars have also speculated that testosterone will lower the immune system function, which goes to show that most of the data displayed - left-handed are more prone to symptoms of a variety of immune system disorders. Moreover, in the concept of left-handed identity, perhaps the importance of exercise is much more than only scientists understanding nuances of neuropsychology. We have to admit, in some sports, the left-handers indeed prevail. First, in baseball, compared to the right-handers accustomed to standing on the left side of the home plate to play, the left-handers have longest fight ability. Many right-handers baseball player in order to narrow the distance with a base, and more clearly see the path of right-handers pitching the ball, they will actively practice stands at the home on the left to combat. Second, in the right-handed quarterback for the main football team, the striker must pay special attention to the left, because they have to defend the dead corner of the quarterback, to prevent a clash of opposing players. At this time, the left-handed quarterback players often make the team's players dumbfounded, because they always rely on the rare left-handed advantage on the court to repeatedly perform outstanding. Our website will provide a discount as for Guild Wars 2 Gold, Buy Guild Wars 2 Gold and Guild Wars 2 Gold, so that more students can pay. This practice is favored by many players.
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