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TIL in Sichuan opera, there is a performance art specifically dedicated to changing theatrical masks so fast that it’s imperceptible. It’s called Bian Lian (“face changing”), and the sleight of hand technique behind it is classified as a level two national secret by China’s State Secrets Bureau.

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Z8ELY TIL Honeybees can learn basic math such as subtraction and addition
d8rLj TIL that hundreds of African-Americans in the Selma to Montgomery marches wore yarmulkes after learning that Jews wear them in the presence of God, believing that God was present in their march for freedom.
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