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TIL that one of the first devices made to estimate electric voltage, the "Frog Galvanoscope" of the late 1700s, was named after its crude method of attaching electrical wires directly to the exposed nerve of a recently skinned frog leg, which would jerk suddenly in response to electric current.

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5rEk TIL an anti animal cruelty activist infiltrated an Idaho dairy farm. After exposing workers beating and sexually abusing cows, the Idaho legislature passed a bill making it illegal to film on farms and dairies.
6ExQw TIL Hans Zimmer, composer extraordinaire behind Interstellar among others, played synthesizers with The Buggles ("Video Killed the Radio Star").
N75rE TIL: Many Native North American cultures have historically recognized the existence of a third gender, or a "two-spirit" person. Someone who is regarded as neither male or female
O5DX TIL Radiation is often measured as “banana equivalent doses,” where 1 dose is the amount of radioactivity in a banana.
X0eZ8 TIL that the trope of vampires dying in the sun was only created in 1922 during the ending of Nosferatu