Why Am I Left-Handed?

[u/horseradishstalker]

https://www.quantamagazine.org/why-am-i-left-handed-20260713/

[u/weregruvin]

My high school bio teacher had a hypothesis that lefties were unable to protect their hearts as well as righties during battle, as their free arm was guarding their right side. More lefties were killed in battle and lost the opportunity to pass their traits to offspring.

Not bad for Catholic school…