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TIL there was a natural nuclear reactor in present-day Gabon that produced about 100kw of energy 2 billion years ago, running for thousands of years. This is the only known example of naturally occurring nuclear fission.

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e0K6D TIL Manta rays have the largest brains of any fish — with specially developed areas for learning, problem-solving, and communicating; they might even recognize themselves in mirrors, a sign of self-awareness
W7RX4 TIL when George R.R. Martin was writing A Storm of Swords he skipped over the chapter with the Red Wedding in it & finished the rest of the book before making himself go back to write it. It was very hard & painful for him to kill off the characters in that scene that he'd lived with for so long.
p85Ee TIL C418, Daniel Rosenfeld, Creator of the Minecraft soundtrack created a remixed version of the Stranger Things Theme song, which led to him writing and producing the theme song for the talk show Beyond Stranger Things
4kVLa TIL: Every Java class binary starts with the 8-digit hexadecimal number 0xCAFE_BABE. If you own an Android phone, this "magic number" is likely compiled into thousands of individual files on it.
RAV6 TIL Spotify has a CPR playlist. All the songs on the playlist have a tempo of 100 to 120 bpm, which is the same tempo at which one should give chest compressions during CPR. Coincidently, two of the songs are: “Another One Bites the Dust” by Queen and “Stayin’ Alive” by The Bee Gees.