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TIL the "Einstein refrigerator" is an absorption refrigerator which has no moving parts, operates at constant pressure, and requires only a heat source to operate. It was jointly invented in 1926 by Albert Einstein and his former student Leó Szilárd, who patented it in the US on 11/11/1930.

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VoRQ TIL a Moon-sized diamond was found in space, and it has been dubbed “Lucy” in reference to the Beatles’ song, “Lucy in the Sky with Diamonds”.
epwkD TIL that astronauts in the ISS don’t shower for six months (or however long they’re up i space). Instead, they use damp towels and waterless shampoo to clean themselves.
OodDR TIL ancient clay tablets were usually temporary, erased by water. Fires meant to destroy buildings and libraries fired the clay tablets, ironically preserving them.
eL96 TIL that flossing was dropped from the US government’s dietary guidelines because no reliable study exist to prove its health benefits.
j6dMX TIL Massachusetts is the only state that doesn't allow happy hour.