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TIL that the precursor to LASIK, Radial Keratotomy, where operations to correct vision would be done “manually with a blade”, often led to many issues, such as vision loss and infection because the incision remains open indefinitely. "It is well documented that RK incisions never completely heal..."

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dD0JQ TIL there are more possible iterations of a game of chess than there are atoms in the observable universe. The exact number of possible iterations is estimated to be around 10^120, while the estimated number of atoms in the observable universe is around 10^80
Lk41Q TIL as a prank, a man once climbed Mount Hood in the middle of the night and surreptitiously left a morning newspaper and a quart of milk for his friends, who were spending the night on the summit
ZP1R TIL that regular marijuana users are less likely to be obese, even after adjusting for other factors that could influence body fat and health. (Pot is an appetite stimulant, but an ingredient in marijuana has been shown to aid in dieting; at high doses it nearly tripled weight loss versus placebo.)
VB69B TIL that in 1914, the wife of the French Prime Minister murdered a newspaper editor to prevent him from disclosing her relationship with him, which had begun while both were still married to their previous partners. She was acquitted because she was deemed to have acted on "uncontrollable impulses".
dDPnZ TIL about resin identification codes. Commonly found on plastics (the "chasing arrows" symbol with a number inside) they are commonly confused with the very similar recycling symbol, though they give no indication of whether a plastic is recyclable