What were you taught incorrectly at school?

TheFartSaver
Is there anything your school taught you that you later found out was incorrect? How long until you found out?

In high school, I was taught that Abraham Lincoln was shot in the hand and died due to sepsis from inadequate health care. I didn't find out this was wrong until around 6-7 years later and well into adulthood.
What were you taught incorrectly at school?
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