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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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x69Zw TIL that French mathematician Abraham de Moivre noticed that he slept more and more as he grew older, and predicted he would die on the day his sleep reached 24 hours. He did indeed die on that day.
dD8WB TIL Coal is slightly radioactive. Coal plants are releasing more radiation into the atmosphere on a daily basis than any nuclear plant.
0wDBj TIL the inventor of reiki, Mikao Usui, suffered a stroke and died while teaching it. Reiki is is used as an illustrative example of pseudoscience in academic journal articles. There is no central authority controlling use of the words "reiki master", & certificates can be purchased online
yVYGM TIL Michael Jackson joined Jimmy Carter on an immunization campaign and gave more than 10,000 children tickets to his concert as a reward for being immunized against preventable childhood diseases
vP47D TIL: The oldest humanoid archeological find in Japan dates back over 22,000 years. It contained the fossils of 2 males and 3-7 females. It is believed that they were speared, cannibalized, and then thrown into the fissure. The males were 155cm tall while the females were 140cm.