Left Hand

You would use “left-handed” with a hyphen. If you want to say “left hand” you would use a space not a hyphen. Abrams, which adeptly breaks down a mathematical explanation for why the rate of left-handed people has remained steady—about 10% of the population—for the last 500,000 years. The reason boils down to two words, “competition” and “cooperation,” and how the balance between those forces plays out in human societies.

Just why one in 10 people favour their left hand is a mystery. A straightforward genetic link hasn’t been proven, and it is possible for two right-handed parents to have a left-handed child. Theories include: Genes – perhaps genetic factors predispose a child to favour the right hand. Left-handed people are said to be good at complex reasoning, resulting in a high number of lefty Noble Prize winners, writers, artists, musicians, architects and mathematicians. According to research published in the American Journal of Psychology, lefties appear to be better at divergent thinking.

n a study from 1975 on 7,688 children in US grades 1-6, left handers comprised 9.6% of the sample, with 10.5% of male children and 8.7% of female children being left-handed. Handedness is often defined by one’s writing hand, as it is fairly common for people to prefer to do a particular task with a particular hand. Right-handed people are more skillful with their right hands. Studies suggest that approximately 90% of people are right-handed. Left-handedness is less common. Studies suggest that approximately 10% of people are left-handed.