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TIL El Salvador's former national currency was the Colon which was in use from 1892 to 2001. It was named after Christopher Columbus known as Cristóbal Colón in Spanish.

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via reddit.com

16pWW TIL that there's a museum in Japan that's dedicated to rocks that look like human faces!
gM17L TIL: that in 1903 a pair of nearly identical strangers ended up in the same prison in Kansas which helped fingerprinting become widely accepted by law enforcement agencies in the U.S.
v1nKK TIL Only about 10% can freely control the muscle that is stretching the eardrum. "Ear rumbling" is flexing the tensor tympani muscle, that makes the same noise and vibration you sometimes get when swallowing or yawning. Some people can flex it endlessly.
jN0BE TIL that Betty White holds the Guinness World Record for longest TV career by an entertainer, with credits spanning 80 years (1939 to 2019)
VM5LZ TIL of the "Vitamin D Paradox" among black people. Researchers couldn't understand why black folks had better bone health while 80% were chronically Vit D deficient. They discovered black folks make less of a protein which interferes with Vit D. They have less overall but use it more efficiently.