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TIL Euler's often wrote the earliest written reference on a given matter. In an effort to avoid naming everything after Euler, some discoveries and theorems are attributed to the first person to have proved them after Euler.

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rN9Re TIL that sticking out one’s tongue is a sign of respect or agreement and was often used as a greeting in traditional Tibetan culture. Apparently, a cruel ninth-century Tibetan king had a black tongue, so people stick out their tongues to show that they are not like him (and aren’t his reincarnation)
epPOg TIL Cute aggression refers to the overwhelming urge to squeeze, pinch, or bite something extremely cute, typically without any desire to cause harm.
o7pr TIL That spiked dog collars were invented in ancient Greece and were originally designed to protect dogs throats from wolf attacks.
kJ5e TIL The U.S. briefly banned sliced bread in 1943
Rp8a TIL that the United States experiences 75% of the worlds known tornadoes