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Why is left handedness rare?

Fact - Left handedness is a result of the amount of cooperation and competition. Highly competitive environment would lead to a 50-50 ration while in a fully cooperative population, everyone would be same-handed.
Pic Credits: © 2008 Seán A. O'Hara | looking at my left hand | CC BY-SA | Modified

Left handedness is a result of the amount of cooperation and competition. In highly competitive environment the ratio of right-handed to left-handed would be 50-50. While in a fully cooperative population, everyone would be same-handed.

For instance, cooperation in early man would mean sharing the same tools. Competition, on the other hand, would dictate being the opposite.

So humans, on an average, are 80% cooperative and 20% competitive?

Prof. Daniel M. Abrams along with his graduate student Mark J. Panaggio, have come up with a model to predict the handedness in different groups. It is able to predict correctly why there is a higher percentage of left-handed people in certain sports, for example, baseball.

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