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TIL that before the heart/lung machine was invented, a doctor oxygenated his patient’s blood by routing it through another person. Parents often served this purpose while their children had heart surgery.

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wP9W TIL that bananas are slightly radioactive because of their potassium content and the small amounts of the isotope potassium-40 found in naturally occurring potassium. The banana equivalent dose (B.E.D) of radiation is sometimes used in nuclear communication to compare radiation levels and exposures.
OmOe TIL Oxpeckers, the small birds you see in photos perching on antelopes & wildebeests (Elephants shake them off usually), were once thought to help by eating illness-causing ticks. It was found that the birds open wounds wider and drink the blood of their hosts - they’re parasites themselves.
VMajZ TIL As the Geneva convention rules that don't allow employing POWs in dangerous tasks; Denmark designated 1,000 Germans as "Surrendered Enemy Personnel" rather than POWs and forced them to work in mine clearance. In 6 weeks, 250 of them have died and were replaced by 1,200 more surrendered Germans.
PQbO TIL that the word “Jay” used to mean stupid, and was eventually applied to country folk, who were seen as unworldly. When these country folk, or Jays, came to the city, they didn’t understand traffic signals and crosswalks and crossed wherever and whenever they could. Thus, they were “jaywalking.”
VBMXQ TIL it was only 200 years ago Humans discovered Dinosaurs.