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TIL that Technicolor movies were filmed on three rolls of film with the image split using a prism into three color images. Each film roll was then developed and dyed a complimentary primary color and then the three rolls were laminated together to create a full color roll of film

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R5wA1 TIL the opium factory in Ghazipur, India has been in continuous operation since 1820. Established by the British East India Company the factory supplied opium for the opium trade which led to the two opium wars, first in 1839 and 1856 over the forced importation of opium to China.
grayb TIL Gravel and crushed stone are two different things, with different properties and uses, and aren’t always interchangeable.
4o4X TIL NWA’s Straight Outta Compton was the first album to reach platinum status without the support of airplay or a major tour
dQNE TIL that Germany still has a “day of rest” (Ladenschlussgesetz) law that forces most businesses to close on Sunday.
MvRV TIL that the Royal Navy served sailors daily rum rations until 1970. The last day of rum was called Black Tot Day. Sailors wore black armbands and ships held mock funerals for tots of rum.