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101

TIL Iwo Jima changed its name back to Iōtō in 2007

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Xbe6 TIL that fireflies are the most efficient producers of light in the world, even when compared to modern light bulbs.
GOAE TIL that when the Chinese stopped killing sharks for sharkfin soup at the behest of Yao Ming, that people instead shifted to killing Manta Rays
rNvl4 TIL the English word “set” has 430 different meanings listed in the Oxford English Dictionary, giving it the longest dictionary entry at around 60,000 words.
neymP TIL: In 2013, a school shooter wore a "KILLER" shirt to sentencing, flipped off the victims families, and said he masturbates to their deaths (video)
oBK4o TIL Obsidian can be made into surgical scalpels by flint knapping, creating an edge only one molecule wide and the edge is so smooth and sharp it can cut between cells.