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TIL the hardest material available to Pacific Island natives on atolls was shark teeth prior to the arrival of outside explorers. Islanders crafted serrated saws by embedding rows of shark teeth into wooden or bone handles, securing them with plant fibers or sinew.

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6JMw TIL a German U-boat mysteriously disappeared in 1945 and the sole survivor of its crew, who missed the voyage due to illness, found out about the fate of his shipmates in 1999 by watching a NOVA episode about the submarine
kOMD7 TIL of serial killer Joe Metheny, who minced his victims into hamburgers and sold them at his own BBQ stand.
worXW TIL About The Pig War, a confrontation in 1859 between the United States and the United Kingdom over the British–U.S. border in the San Juan Islands, so called because it was triggered by the shooting of a pig.
YEY7 TIL that once the British 1881 census was compiled, officials noted an alarming rise in the number of individuals being reported as “deaf and dumb”. After enquiries were made, it transpired that many enumerators had recorded babies as being deaf and dumb simply because they could not speak.
LQxov TIL a Korean crown prince (posthumous name Sado) went murderously insane whilst he was regent, torturing, assaulting and killing courtiers and servants on a whim. He was executed by his father King Yeongjo by being locked in a rice chest and starved to death.