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TIL that radio waves aren’t just really high-pitched sound waves, they’re actually big light waves.

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woXOW TIL convicted NXIVM cult leader Keith Raniere has had many girlfriends who died untimely and suspicious deaths. One girlfriend, who simply disappeared, was last seen alive at a NXIVM meeting.
neXpY TIL the inventor of the GameBoy and Duck Hunt, Gunpei Yokoi, died in his fifties after rear ending someone and then being hit by a car when he went to check on them.
awA40 TIL of Ball Lightning, an unexplained phenomena where a luminous ball of what looks like lightning appears at ground level, moving unpredictably and 'bouncing off buildings, people and cars'. Despite many accounts, very little is known about why it occurs.
M7EWK TIL the barrel and grip of the Glock 19 are approximately 12mm shorter than those of the Glock 17, and it comes standard with a 15-round magazine. Notably, the Glock 19 is compatible with magazines from the Glock 17 and Glock 18, allowing for capacities of 17, 19, 24, and 33 rounds.
VJa8 TIL there are no narwhals kept in captivity. All attempts to do so have been unsuccessful