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TIL that Japanese POWS provided a vast wealth of information during WWII. This was because most Japanese soldiers were unaware of the rights they retained as prisoners under the Geneva convention. Many also felt indebted to American troops for the courteous treatment they received.

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Dobg TIL renowned French philosopher and mathematician Descartes had a fetish for cross-eyed women.
5YbbP TIL In 2016, a study that examined over 464,000 recordings of pop music recorded between 1955-2010 found that since the 1960s, pop music had less variety in pitch progressions, grown average loudness levels, less diverse instrumentation and recording techniques, and less timbral variety
8a5da TIL of Oklahoma earthquake swarms, an increasing number of earthquakes in the state since 2009 related to the Oil & Gas Industry injecting wastewater in deep ground.
NXeLN TIL the Tsar Bell has been destroyed in fires twice. The current version is the largest bell in the world, and has never been rung. However, students at UC Berkeley simulated it's ring in 2016.
gMvPD TIL the bluest blue (to date) was accidentally discovered when a researcher received a grant to explore novel materials for electronics applications and tried to heat together oxides of manganese, yttrium, and indium at two thousand degrees Fahrenheit