Top 10 Crazy Things They Don't Teach You in History Class

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Human history sure can be wild. From medicinal heroin, to mercury-laden hats, to art-based Olympics, you definitely never heard about these things in school. WatchMojo counts down ten crazy things you never learned in history class.

If you want to brush up even more on your history, check out our other videos of the Top 10 Insane Rulers in History:, Top 10 Notable Revolutions:, and Top 10 Badass Historical Women You Probably NEVER Heard Of!:

#10. A Treatment for Female Hysteria
#9. Dividing Your Sleep in Two
#8. Mad Hatters
#7. Art Competitions in the Olympics
#6. Sparta’s Money
#5. Great Fire of London
#4. Heroin Was Used to Treat Coughs
#3,#2, #1???

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