The majority of human beings are right handed. In fact, less than 20% of the world’s population is left handed. Statistically, there are twice as many male left handed people as there are females. Researchers have also found that left handed people are more likely to have allergies, migraines and have difficulty sleeping. “Sinistrophobia” is a fear of left handed people. Psychologists are not sure why even such a fear exists at all. Many famous people are left handed such as Barack Obama, Bill Gates and Jimi Hendrix. In fact, 4 out of the most recent 10 US presidents were left handed. Some manufacturers build left handed versions of things, such as can openers, scissors and pens for the benefit of left handed users. However, these items are rare and most left handed people usually have little choice but to get used to using articles designed for right handed people. Sometimes this is a very significant problem, for example many rifles discharge the hot shells of expended rounds from the right of the weapon. So a left handed soldier would have to learn how to handle such a rifle with his/her non-master hand acting as the master hand. Even rarer than left handed people are ambidextrous people who can use either hand equally well. They make up about 1% of the world’s population.

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