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TIL fish pee from their gills and the reefs they pee on thrive because of it.

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G7yE TIL King Zog of Albania was the only national leader in modern times to return fire during an assassination attempt.
DQQKp TIL: Polonium-210 in tobacco contributes to many of the cases of lung cancer worldwide
x6bdk TIL that evidence for the effectiveness of dental floss is limited. Several academic reviews have concluded either that flossing is no more effective than tooth brushing alone, or that the evidence in favor of flossing is weak, biased or of low certainty.
VMj08 TIL In Firozpur district, Punjab, everyone who applies for a firearm license must plant ten trees and provide photos of them doing so
7aDx TIL Olympic athletes may participate independently, without an associated country (they fly the Olympic flag)