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No other placental mammal that we know of prefers one side of the body so consistently, not even our closest primate relatives. But being right-handed may have deep evolutionary roots in our lineage. And yet, being a leftie does seem to come with some unexpected advantages.

Big thanks to Julio Lacerda ( / juliotheartist​ ) for the excellent right-handed Neanderthal illustrations!

Produced in collaboration with PBS Digital Studios: / pbsdigitalstudios

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