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TIL that sea urchins have teeth, nicknamed "Aristotle's lantern"

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x6NM0 TIL about mechanical television from the 20s and 30s, which used a rotating device to scan a scene and generate a signal which would then be viewed on the other end similarly
R7Yj8 TIL the phrase "I have a bridge to sell you" comes from the exploits of George C. Parker, a comically skilled con man who was infamous for "selling" the Brooklyn Bridge and other scams with great success.
dWNE TIL that when we landed on the moon we placed reflectors that can reflect any laser pointed at it back to the earth, which smashes the conspiracy that we never went.
vPdbK TIL the month we are born do have some statistical connection to our health and likeliness of some diseases to manifest.
Oo9Ra TIL that the U.S. icon "Uncle Sam" was based on Samuel Wilson; a meat inspector during the War of 1812.