Symmetric brains in lefties

Ten percent of the human population is left-handed. Over the years this has been attributed to a number of intangible reasons. In recent years, research has shown that handedness, or hand dominance, may stem from the symmetry of the brain during early development. Genes determine this embryonic development and a certain genotype switches which hemisphere controls handedness and language skills. But it's even more complex - lefties have more symmetric distribution of language across the brain.

Read more about what science is learning about why some people are left handed.

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