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TIL that about 16% of wild birds have been known to hybridize with other species of birds. The mallard can hybridize with at least 40 other species. The extent of hybridization calls into question the modern definition of "species".

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6a8X TIL that the “Sky Beam” that shoots out of the Luxor Hotel/Casino in Las Vegas attracts so many insects that it has established a new ecosystem of moths, bats, and owls.
a8pdM TIL of Ticker Tape Synesthesia, or seeing words in writing as they're spoken, sort-of like a news ticker or subtitles. There's no known cause, but it's thought to result from excess inter-connectivity of neurons in the different sensory regions of the brain.
rN1oy TIL That the TOR Network was created by the United States Naval Research Laboratory to protect American Intelligence communications.
D1O5j TIL Sony reportedly fired Tobey Maguire as Spider-Man and nearly replaced him with Jake Gyllenhaal because they suspected Tobey of faking an injury to negotiate bigger pay.
dGPB TIL That having both red hair and blue eyes is the rarest combination in humans, occurring naturally in only one percent of the human population.