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TIL about the key distinction between “proximate” and “ultimate” analyses in biology & psychology

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PY41w TIL that Stereoscopic 3D television was demonstrated for the first time in August of 1928.
x6v7D TIL in 2015 Burger King tried to collaborate with McDonald’s to make a McWhopper, a burger combining ingredients from the Whopper and Big Mac, but McDonald’s declined the offer.
R70L9 TIL David Prowse, who played (but did not voice) Darth Vader in "Return of the Jedi", has never been paid any residuals from the film, because LucasFilm claims the film never made a profit.
kLg TIL there’s a bridge in Norway built from Leonardo De Vinci’s drawings 500 years earlier.
nWNBB TIL tat n Croatia there’s a small island of 0,14km² with 23km of dry stone walls that were built to delimit agricultural plots and protect the olive trees and vines from the wind. Seen from the sky the island looks like a maze, a puzzle or a fingerprint