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TIL nearly half of all people who have heart attacks don't realize it at the time.

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via reddit.com

Y7X47 TIL: Since 1963, the Japanese receive a commemorative silver sake cup on becoming a 100 years old. Due to increasing numbers of citizens reaching a 100, the cup size was shrunk and the solid silver was replaced with a silver-plated nickel alloy saving the Japanese government $1 million annually.
mxRDy TIL of the 2018 seismic event of Mayotte, a 20 minute long earthquake-like event that was detected by instruments across all the globe but wasn't felt by a single person, and lacked two of the three types of waves usually detected in earthqakes.
D1jkp TIL That John Wayne didnt like the Way Clint Eastwood Movies Portrayed the West, going so far as to send him a Letter Criticizing his Directing Skills
69lr7 TIL Radioisotope Thermoelectric Generators, used to power Voyager 1 since 1977, were also used to power the Mars Perseverance rover, launched in 2020 and still active on Mars today.
R571 TIL that Lucifer, as referred to in the book of Issiah, was actually a Babylonian king.