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TIL of the Schwerer Gustav, a German railway gun used against allied forces in WWII. It took a crew of 2000 men to lay track and to operate. Weighing in at over 1,300 tons and firing a 15000 lb shell, it is the largest gun ever used in combat.

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awDpL TIL the British & Irish Plug is Regarded as the Safest in the World
a8rb0 TIL A man in India carved a 110 meter-long (360 ft), 9.1 meter-wide (30 ft) and 7.7 meter-deep (25 ft) path through a ridge of hills using only a hammer and a chisel. After 22 years of work, he shortened travel distance from 34 miles to 9 miles.
loa47 TIL that the U.S. only spends 12% of its total budget on military, despite commonly held notions that it spends upwards of 40 - 70%.
ddvB TIL that the New York City Subway still operates several train cars constructed in 1964 in regular service. This specific model owes its longevity to its superior durability, craftsmanship and structural quality. Retired cars from this model are shipped out to the Atlantic Ocean for artificial reefs
YpkBG TIL that during the Austro-Prussian War, Liechtenstein had an army of 80 men. During the conflict no men were injured or killed and they returned home with 81 men because they’d made an Italian friend along the way. The army was then disbanded and Liechtenstein hasn’t had a military since.