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TIL about Earth’s oldest known natural Nuclear Reactor, located in Oklo, Gabon. It's around two-billion years old, and was thought to have been active for several thousand years. Its average power output was 100 kilowatts, enough to run a few dozen toasters.

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ERBd TIL of the word “aptronym”, used for a personal name aptly or peculiarly suited to its owner, and its opposite, “inaptronym”. Examples of inaptronyms are Frank Beard, the only member of ZZ Top to not have a beard, and Donald Black, white supremacist.
Vdp4 TIL: The Karate Kid (Ralph Macchio) is now the same age as Mr. Miyagi was when Pat Morita played him in the movie
jNKWa TIL that the normal intelligible outdoor range of the male human voice in still air is 180 m (590 ft 6.6 in). The silbo, the whistled language of the Spanish-speaking inhabitants of the Canary Island of La Gomera, is intelligible under ideal conditions at 8 km (5 miles).
4kVEg TIL Sweden had a colony in the Americas. "New Sweden" straddling modern-days Pennsylvania, New Jersey, and Delaware
j6P0j TIL A Missouri Christian school's staff were charged with child abuse, in part, for punishing misbehaving children in pits of cow manure