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TIL that while yellow is a primary color for paint it is not a primary color for light. This is why we have RGB lights and not RYB.

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0m7v TIL Polish doctor Eugene Lazowski saved 8,000 Jews during the Holocaust by injecting dead typhus cells into them, allowing them to test positive for typhus despite being healthy. Germans were afraid of the highly contagious disease and refused to deport them to concentration camps.
BJQW TIL if Lance Armstrong’s 2005 Tour De France title was given to the next fastest finisher who hasn’t been found to dope, they’d have to give it to the 23rd place finisher
1aLVW TIL Chinese Emperor Xianfeng's reign title "Universal Prosperity", did not reflect the situation. When he came to the throne at 19 in 1850 the first of a series of popular rebellions began that would nearly destroy the dynasty
dDynd TIL that The battle on ice, known as the 'ice massacre', is the only instance in history of a full-scale battle on a frozen lake, resulting in the Teutonic knights being dramatically defeated when the ice gave way beneath them under the weight of their armour
KO6pQ TIL Jackie Kennedy wore her blood-splattered pink Chanel suit for the rest of the day after JFK’s assassination. When asked to change her outfit, she replied “I want them to see what they have done to Jack.”