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The most dangerous pollutant might not even be known yet.

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Bvbr TIL in 1908, Lieutenant Thomas O. Selfridge did a test flight with Orville Wright in one of his planes to see if the US Army would be interested in buying the plane and its design. Orville crashed the plane and the lieutenant died. The US Army purchased the plane anyway.
R1m6 TIL Quicksand alone is considered harmless, and it’s impossible for humans or animals to actually drown in.
dYn8 TIL that Dwayne Johnson’s beard in the movie Hercules was made of yak testicle hair.
Wamo TIL the worst shark attack in human history was when the USS Indianapolis was sunk sending 900 men into the shark infested waters. Only 300 men survived.
4W6o TIL Dolphins can overcome sleep deprivation and remain constantly vigilant for days at a time by resting one half of their brain while the other half remains conscious.