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TIL the sound mourning doves make while flying when startled is NOT a vocalization, but a "wing whistle" that is a natural alarm system to alert other birds to potential predators

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via reddit.com

Menl0 TIL of the "Brown Ocean Effect", wherein tropical cyclones maintain their strength of even intensify after making landfall. Tropical Storm Erin (2007) and Bill (2015) both exhibited characteristics of this phenomenon.
kJaQ4 TIL according to the 2020 census. Azusa, California has a population of exactly 50000
VV50 TIL: The Ottoman Turks unknowingly used the Rosetta Stone as a building slab for a military fort. The French captured the fort, and became fascinated with the stone, which unlocked the lost secrets of Ancient Egypt.
b98va TIL that the Blue Whale's major arteries and veins are so large that a small child can pass through them.
4ekR TIL a federal judge ruled drivers allowed to flash headlights to warn of speed traps.