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TIL that at least one malaria strain has evolved to make infected mosquitoes feed more frequently. This is because mosquitoes’ immune systems eventually kill most diseases they consume, requiring them to feed again quickly to spread a disease.

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y6Pw TIL that on August 25, 1970, a group of Icelandic farmers blew up a dam project on the Laxá River that would have swept away their farms. Around 100 farmers turned themselves in but not one would snitch on who lit the fuse. They all walked free.
p8Qxe TIL That Suzanne Vega's song, "Tom's Diner" was so clear, it was used to refine the MP3 compression algorithm.
JY6w8 TIL Jason Alexander threatened to quit “Seinfeld” in the third season. After the table read of “The Pen”, which features only Jerry and Elaine, Alexander pulled Larry David aside and said “if you write me out again, do it permanently.” In 9 seasons, that was the only episode he wasn’t it.
vrvK TIL there is a sound effect of a woman on a police radio that has been used in countless movies,tv shows, videos games etc and nobody knows where it originated from or who the woman is.
R78e1 TIL that for Japanese traffic lights blue means go! A very blue shade of green is used, green enough to satisfy international regulations. This is because historically the Japanese language only had words for black, white, red, and blue, and that green is considered a shade of blue.