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TIL Lymphocytes kill targets including tumor cells by inducing them to undergo programmed cell death aka apoptosis.

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9YnQ7 TIL the chorus in Asereje by Las Ketchup isn't complete nonsense, just a Spanish take on the lyrics of Rappers Delight (I said a hip-hop, the hippy, etc)
9wloG TIL in the Lorax (2012) by Illumination, "How Bad Can I Be?" only exists in the film because the original, "Biggering", was not considered palatable because of it's much darker commentary on big business, anti-corporatism and greed as the author (Dr. Seuss.) intended.
bGDa TIL that, according to the Department of Energy, commuter rail only has about 10% better actual fuel economy than cars, and buses are the worst at more than 20% lower given its sparse ridership.
mOVx TIL licence plates in the Canadian Northwest Territories are shaped like polar bears.
Y7BVd TIL in France there is a group called the Garden Gnome Liberation Front which steals garden gnomes with the goal of "freeing" them and "returning them to the wild".