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TIL Disney's "Susie the little blue coupe" (the film that would directly inspire the design philosophy of Pixar's "Cars") is in the public domain due to failure of copyright renewal. The soundtrack however remains in copyright.

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W7NGL TIL the evolutionary leap from egg laying to placental birth may have been helped by DNA from an ancient retrovirus, which coded for a protein allowing cells around the placenta to fuse, blocking the exchange of maternal-fetal blood and preventing the mother’s immune system from harming the fetus.
Oo8YL TIL that during screenings of the 1959 film The Tingler, - a film about a creature a creature that gets inside a person’s spine, causing them to feel a tingling which can only be stopped by screaming - buzzers were placed in random seats that caused the audience to feel tingling during the film.
M7geV TIL a millipede species that actually has 1000+ legs was first described in 2021, living 50 - 200 ft (15 - 60 m) underground in Western Australia
gMemL TIL that houses in Bermuda have white stepped roofs to harvest rain water and store it, as the island has no fresh-water springs, rivers or lakes.
E1Qj0 TIL: Owning a cat can reduce the risk of heart attacks and strokes by more than a third.