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TIL that flags fly at half-mast or half-staff to make room for an invisible flag of death to be flown above it.

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ep6mJ TIL that the day after John Hinckley Jr. attempted to assassinate President Ronald Reagan. Hinckley's Röhm RG-14 six shot revolver was given to the ATF which was able to trace the gun's origin in just 16 minutes to being purchased at Rocky's Pawn Shop in Dallas, Texas, on October 13, 1980.
WkLWA TIL that the core of the Earth is about 2.5 years younger than the crust. This is due to gravitational time dilation, a consequence of General Relativity
koxe TIL night vision is always green because the human eye can see more shades of green greater than any other colour.
x6Xwk TiL that Brian Wilson was only 23 years old when he produced, arranged, and co-wrote the Beach Boys album "Pet Sounds". The album has since been credited for revolutionizing music production and has appeared in many "greatest records of all time" lists.
Ypey7 TIL moths vibrate their genitals to avoid bats. This action produces ultrasound that jams bats’ built-in sonar, rendering the moths temporarily “invisible”.