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TIL The longest reverb in the world occurs in the bombproof Inchintown fuel tank built in the late 1930s/early 1940s in Invergordon, Ross-shire, Scotland. It lasts for approximately 112 seconds.

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KOBX6 TIL that in order for a tesla coil to generate long arcs the previous arc ionizes the air and then the second arc (which is fired faster than the first can dissipate) jumps through the first arc, affectively doubling the arc length.
78YrP TIL there is a stable population of rhesus macaque monkeys in central Florida. They were released on an island in a swamp as part of a jungle cruise attraction in 1938, but escaped the island because the tour operator didn’t know they could swim.
LQkLP TIL people in the Middle Ages believed the equator to be impassably hot. Therefore, either Jesus would’ve have to appear separately to the Southern Hemisphere or its natives would be damned to Hell under the beliefs of the time.
EgG5p TIL a Chinese factory taken over by unsupervised workers during the Cultural Revolution paid workers even if they didn't come to work. By the time someone was sent to investigate because of subpar products, almost all equipment was broken or stolen, and only 4% of the workers were still working.
QNEgM TIL: That following the capture of 81 German soldiers as prisoners of war, Germans soldiers attempted/largely succeeded in massacring an entire village. Only 13 out of nearly 700 men survived. The women survived thanks to 1 sympathetic soldier who freed them.