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TIL pulse oximeters are calibrated for white skin; the darker your skin, the more likely the pulse ox will overestimate your oxygen level

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Z8JP4 TIL Marie Skłodowska Curie changed the world not once but twice. She founded the new science of radioactivity – even the word was invented by her – and her discoveries launched effective cures for cancer. She is the 1st woman to win a Nobel Prize, and 1st person to win a second Nobel prize.
J1w81 TIL of the U.S. Navy's Nasty-class fast patrol boats, which were Norwegian-designed and used for covert operations during the Vietnam war
g5J9 TIL Stephen Hawking once dined in the company of Edward Teller,pioneer of the hydrogen bomb, and typed “He is Stupid” in his speech synthesizer without bothering to lower the volume
9gPp TIL a fully loaded C-130 Hercules can carry $2.4b in cash. In 2003, twenty-one shipments of American cash totaling 363 tonnes were flown into Iraq. $6.6b of that money is totally unaccounted for and could be the largest cash theft in American history.
neXjd TIL Lt Colonel Matt Urban fought in seven campaigns in WWII and was wounded seven times. He returned from injury so often that the Germans gave him the nickname “the Ghost.” When he was given the Medal of Honor, his citation referred to ten separate acts of bravery during just the Normandy campaign.