In fact, they only represent about 10 per cent of the human population.

But a study suggests that the reason lefties are in the minority isn't anything suspect — rather, it boils down to the fact that the human race cooperate more than they compete.

A pair of researchers from Northwestern University have for the first time analysed real-world data to establish whether an existing hypothesis — that cooperation breeds same-handedness — is correct.

Daniel M. Abrams, one of the researchers, explains to SciGuru:

"The more social the animal — where cooperation is highly valued — the more the general population will trend toward one side.

The most important factor for an efficient society is a high degree of cooperation.

The text above is a summary, you can read full article here.