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TIL that Barrier Reef is the world's largest coral reef system

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WkELN TIL some emergency vehicles can emit a low sound to vibrate vehicles and can help alert the hearing impaired to their presence.
rNwVx TIL Hawaii’s ecosystem has no seagulls
9wbbp TIL in 1610, Opossunoquonuske, a female chieftain of the Powhatan Confederacy, used “feminine guile” to lure 14 English settlers to a feast, convincing them to leave their weapons on their boat. It was a trap—her warriors ambushed them, killing 13. Only one man survived.
LkK1Z TIL the United States Navy Pre-Flight School created a routine to help pilots fall asleep in 2 minutes or less. It took pilots about 6 weeks of practice, but it worked — even after drinking coffee and with gunfire noises in the background.
JYJj4 TIL that a 16th century Christian mystic/magician claimed to have come in contact with angels who shared with him the language spoken in the Garden of Eden. It has been called "Enochian" because Enoch was supposedly the last person to speak it, and it's used to cast spells in Enochian Magic.