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TIL Janet Jackson's Rhythm Nation music video produces a resonant frequency capable of crashing the hard drives of older laptops.

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BGKD TIL astronomers polished a 25-meter mirror for the Great Magellan Telescope so smooth that the largest bump is .0003 times the width of a human hair
D10Or TIL that Cummingtonite, discovered in Cummington, MA, is an intermediate material with the chemical composition (Mg, Fe2+)2(Mg, ​Fe2+)5Si8O22(OH)2 found commonly in metamorphosed magnesium-rich rocks.
xoZo TIL that slave labor was used to build the White House
DQMGg TIL - there is a class of Stainless Steel alloys, called ferritic or 400 series, that are magnetic, unlike most stainless steel alloys.
LXvV TIL that a man bought a BMW for $1 because of a mistake on the bidding.