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TIL the whistly/chirpy sound you hear when mourning doves take off and fly isn't a vocalization. The sound comes from specially shaped feathers on the wings. See video for examples

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via reddit.com

NXQM TIL that there is a company releasing genetically modified mosquitos with a “death gene” to breed with other mosquitos to decrease mosquito population
OoNNY TIL: one of the reasons the highest rank in the US army is "General of the Army" instead of Field Marshall (as in other countries) was to avoid insulting Gen. George Marshall by calling him Field Marshal Marshall.
MeNja TIL Peter McCathie survived being hit by lightning when he was a teenager and now he’s won the lottery — both events combined come to about a 1 in 2.6 trillion chance.
xVmoB TIL divorce rates increase during times of hardship, war, and major events. Rates increased after World War II because people were quick to marry each other before they went to war. When soldiers returned, they found out that they didn't have much in common with their spouses, so they divorced.
O4JR TIL the Bat'leth (a Klingon sword from Star Trek) is classified as a weapon and has been used in several real-world crimes