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TIL there is one living person who uses an iron lung

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NKxP TIL there are only four original citrus species (pomelo, citron, mandarin, and papeda). All others (lemon, lime, grapefruit, etc.) are hybrids.
OoB7 TIL some paleo-art historians believe that ancient cave art (Lascaux, Chauvet, etc) was meant to be viewed with flickering flames as lighting, giving the images an appearance of motion. This may have been humankind’s first ever cinematic “animation”.
B9Vx TIL In 1860, 1 out of every 7 Americans were slaves to another American.
9bo6 TIL that the “Pinky Promise” originally indicated that the person who breaks the promise, must cut off their pinky finger
OD4X TIL The Apollo 11 astronauts went to the Moon without life insurance. Instead, they signed hundreds of autographs and gave them to family members to sell if they died.