Why More Left-Handed Men are Born in the Winter

Science World Report

Are you left-handed or right-handed? Around 90 percent of the general population is right-handed, and most tools that are sold are optimized for people who work primarily with their right hands. Yet what particularly surprised the researchers wasn’t the left-handedness, but rather when the people were born. We were surprised to see this imbalance was caused by more left-handed men being born specifically during November, December and January, said Ulrich Tran, the lead author of the new study, in a news release. Presumably, the relative darkness during the period November to January is not directly connected to this birth seasonality of handedness, said Tran.

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