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Quite An Interesting Discovery That Left-Handedness May Be Determined By Genes In The Spinal Cord As Early As 8 Weeks In The Womb. I Use To Think It Was Decided By The Brain. But No, It’s Probably The Spinal Cords Before The Brain Takes Control Of Movement. About 10% Of The World Are Left-Handed.

The scientific reason some people are left-handed – Business Insider

https://www.businessinsider.com/why-some-people-are-left-handed-2018-1?amp%253Butm_medium=referral

The answer to why some people are left handed could lie in your spinal cord, according to some research.