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TIL: US fireflies are not the same in the west as the east. Eastern male fireflies glow during flight while Western female fireflies glow very faintly while grounded.

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OR71 TIL over 300 incidents of child murder occurred in 1700s Germany and Austria due to incidents of “suicide by proxy”. Religious people were killing young children in order to have the government execute them so they could get into heaven.
v1RKD TIL of Vin Mariani, a 19th century alcoholic drink that also contained cocaine. Queen Victoria, Thomas Edison, and Ulysses S. Grant all indulged in it, as well as two popes, one of whom appeared on a poster endorsing it.
b6BDZ TIL Samoa switch from driving on the right, to driving on the left in 2009
wLQ1P TIL that the peak of TV attention can be assigned an exact date: Sunday, September 9, 1956, when Elvis Presley made his first appearance on television, on CBS’s Ed Sullivan Show. Its 82.6 percent share of US viewers has never been equaled or bettered.
QJgB6 TIL that due to the effect that gravity has on time, the core of the earth is approximately 2.5 years younger than the surface