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TIL dolphins have been recorded having conversations in which they alter volume and frequency of pulsed clicks to form individual “words” which they string together into sentences in much the same way that humans speak. Each dolphin would listen to a sentence without interruption before replying.

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pZde TIL an Indian man named Jadav Payeng started planting trees on a barren sandbar at 17. He is now 47 and lives in his own 1360 acre forest which now houses rhinos, tigers, deers, apes and elephants.
l76m5 TIL the first use in print of the term 'heavy metal' to describe a genre of music was in the review of Sir Lord Baltimore's 1970 debut album, Kingdom Come, in Creem magazine.
vPvr TIL mirrors are green.
M7g80 TIL that author J.K. Rowling often relied on the fan-made Harry Potter Lexicon while writing the 'Harry Potter' books: "I have been known to sneak into an Internet café while out writing and check a fact rather than go into a bookshop and buy a copy of 'Harry Potter', which is embarrassing."
vPwj7 TIL that the UK's Violet Club nuclear device was so unstable that it required the core to be filled entirely with half a ton of ball bearings to prevent accidental detonation