Why Are People Left-Handed?

TIME

It’s International Left-Handers Day, so it’s time to give left-handers some overdue appreciation.

There was once a time (a long time ago), when people believed that being left-handed meant a person was more prone to « dealings with the devil » and that the trait should be corrected, according to the New York Times. Thankfully, the prejudice is gone, but people are still curious—why do some kids grow up left-handed versus right-handed?

Numbers suggest that about 90% of people are right-handed, and 10% use their left hand predominantly. Notable left-handers include President Barack Obama, Bill Gates and Oprah Winfrey. Some researchers believe that being left-handed is at least partially related to genetics, though it’s likely not the full story.

One 2013 study, published in the journal PLOS Genetics, identified genes and gene mutations that can influence the development of « left-right asymmetry in the body and brain, » Smithsonian.com reports

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