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TIL We Might Have a Negative Leap Second. If UTC−UT1 (Figure 4) continues downward past −0.5 then we might need to have a minute with only 59 seconds for the first time ever. "We are almost as likely as not to experience a negative leap second in the next 12 years."

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m1jaO TIL about Shingo Aomori Japan, the purported true location of the tomb of Jesus Christ. Legend goes that it was his secret brother Isukiri who died on the cross in Golgotha. Jesus then moved to Japan, changed his name to Torai Tora Daitenku, became a garlic farmer with a family, and died there.
R5gQ8 TIL that the "moving sofa problem" is an unsolved problem in mathematics. The "sofa constant" is the size of the largest object that can fit through a hallway with a right turn, and is somewhere between 2.2195 and 2√2
b69o9 TIL that before the German recording sessions for "She Loves You" and "I Want to hold your Hand", the Beatles refused to show up to the recording studio and had a tea party at their hotel room instead until producer George Martin came over to take them.
b66j4 TIL that during World War II, the United States published a spy manual urging middle managers in enemy territory to sabotage their employers by bringing up irrelevant issues, promoting bad workers, haggling over petty details, and holding unnecessary meetings.
7r6eZ TIL an average sized human has 7x10^18 joules of potential energy. Enough to explode with the energy of 30 large hydrogen bombs