Plants are left or right-handed. Look at them. They grow toward one direction, not
necessarily due to the sun. You’re probably most familiar with plants that have tendrils, or twine their way up a post or fence. If you look more closely, you’ll notice that they form consistent right- or left-handed helices as they climb.
Non-human primates are balanced as far as handedness goes–some left, some right–as were Australopithecines. But when our genus Homo arrived, we became more likely right-handed.
Why? Take a guess before you read the article below. Defense? Hunting? Some requirement of balance with our upright position? Maybe a relationship between the right hand and left brain?
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