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TIL that the neutron star 'PSR J1748-2446ad' rotates on its axis 716 times per second, and is the fastest spinning known neutron star. At its equator, it spins at 24 percent of the speed of light.

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XE0mR TIL military planners expected as many as 400 times the casualties that were suffered during D-Day in 1944 for the Allied landing on Japan. The operation was canceled by the atomic bombs and the Japanese surrender.
aw7d0 TIL that an unnamed wealthy property owner regularly buys large mansions just to watch them deteriorate.
LkPrm TIL the Pistol Shrimp can snap it's claw so fast that it fires "bubble bullets" which can travel at 105 feet per second, reach 210 decibels, temperatures of 8,000 degrees Fahrenheit, and also, a flash of light.
j6olE TIL of a group who walked the entire length of China’s Great Wall in 508 days in 1984
VoPk TIL that in 1861 Francis Key Howard wrote an editorial about President Lincoln’s suspension of the Writ of Habeas Corpus. He was subsequently imprisoned and held without trial for two years at Fort McHenry, where his grandfather Francis Scott Key wrote The Star Spangled Banner during the War of 1812