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TIL: The eruption of Krakatoa in 1883 was the loudest sound in recorded history, heard 3,000 miles (4800 KM) away.

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Z8elY TIL: Like all male Swiss citizens, Roger Federer was subject to compulsory military service in the Swiss Armed Forces. However, he was ruled "unsuitable" due to an unspecified injury. Instead he served in the civil protection force & was required to pay 3% of his taxable income as an alternative.
OZoY TIL the Temple liberties in the City of London, founded by the Knights Templar, are exempt from the jurisdiction of the Lord Mayor and Corporation of the City; when the LM tried to enter with his ceremonial swordbearer in 1668, students imprisoned the LM overnight and took his sword away.
dPeB TIL The Kansas State Marching Band did a formation that looked like a phallic object was entering the mouth of South Dakota’s mascot, resulting in a fine and a game suspension of Kansas State’s director of bands.
VBBED TIL about "doubling"—a method of multiplication devised by the ancient Egyptians that required only the abilities to multiply and divide by 2 and to add. This method is still in wide use today as implemented by binary multiplier circuits in modern computer processors.
b05Z TIL that in California, after 4 years of decline, CO2 emissions increased by 35% in 2012 due to the closure of the San Onofre Nuclear Power Plant.