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TIL when the Apollo 13 Saturn IVB upper stage impacted the Moon, the impact was picked up by seismometers put in place during Apollo 12.

Read more nasa.gov

via reddit.com

OonGe TIL The two parts to the word “helicopter” are not “heli” and “copter”, but “helico” meaning spiral, and “pter” meaning one with wings, like pterodactyl.
M7oDm TIL that in 1938, a wallet manufacturer ran advertisements demonstrating that a Social Security card could fit into its wallets. In these ads, it used a sample card featuring the real Social Security Number of the company's secretary
BgkZK TIL that an estimated 1 in 10 people have “inverse salt sensitivity”: if they eat less salt, their blood pressure actually increases
4MER TIL The Minnesota Vikings are the only NFL team to have an actual human as their mascot. His name is Ragnar
7rw77 TIL the sunbittern, native to Central and South America, generally has a subdued brownish coloration while feeding. When alarmed, however, it displays its exceptional chestnut, black, and buff-yellow eyespots on the dorsal side of its wings and its colorful tail, which it uses in defensive displays.