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TIL That there may be a scientific reason that going for a run clears your head. Aerobic activity actually leads to the growth of new neurons.

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X0Jlj TIL before the Large Hadron Collider (LHC) was completely constructed, there were concerns among the public that its high-energy experiments would lead to the formation of micro black holes or strangelets, a dark-matter-like particle that can convert all matter it touches into strange matter.
wLyvP TIL, Mark Hamill's first industry work was at age 22 as a voice actor in an animated spin-off of I Dream Of Jeannie which aired in late 1973.
YpwVW TIL due to a campaign in the 1970s, “Square Dancing” is the state dance in 75% (24 out of 32) of US States that list one.
6EeYJ TIL that Oliver North solicited $10,000,000 from the Sultan of Brunei as a way around US rules on funding Contras in Nicaragua. The money never went to them, but to a Swiss businessman instead because North entered the wrong bank account number.
oLxW TIL Paraguay’s first dictator, José Gaspar Rodríguez de Francia, forbade colonial citizens from marrying one another and allowed them to marry only blacks, mulattoes or natives, in order to break the power of colonial-era elites and to create a mixed-race or mestizo society.