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TIL Stonehenge has been deconstructed and rebuilt multiple times, making it virtually impossible to know precisely how the monument was originally oriented.

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GAR75 TIL Galileo was convicted of heresy partially due to a misunderstanding. In his book he gave the character arguing against Heliocentrism the name "Simplicio" after a famous philosopher. In Italian this could also be construed as "simpleton" though and the church/Pope took it as him insulting them.
N7pWP TIL That Nazi Germany asked if J.R.R. Tolkien was Aryan before translating 'The Hobbit' into German. He responded pointing out the "incorrect Nazi aumption" on what Aryan means and expressed regret of having a german surname.
ANBXg TIL that there are no weight classes in professional sumo wrestling. Some wrestlers have faced opponents over twice their weight, relying on superior technique rather than size.
JYDgm TIL desegregation resulting from Brown v. Board of Education led to the layoff of 38,000 black teachers when school districts were integrated, even though black teachers had a greater percentage of college attainment than their white counterparts. 90% of black principles were also laid off.
4Xa0R TIL that neutron radiation from deuterium nuclear fusion can be exploited by breeding more deuterium from ordinary hydrogen.