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TIL radioactivity was discovered accidentally due to bad weather. H. Becquerel stopped his experiments on uranium that required sunlight in an overcast day and put uranium crystals and photographic plates away in a drawer. When he opened the drawer, he discovered the radioactive nature of uranium.

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OMwa TIL: The Virgin Mary is the only woman mentioned by name in the Quran.
neoJr TIL when Alfred Hitchcock got the rights to the novel that originated 'Psycho' he bought all copies to keep the plot twists under wraps
6EooZ TIL about the Soong sister's of China. They lived through years of war and revolution and helped shape the history of their nation. They married major public figures of opposing political factions and became prominent political figures in their own right.
DQ8Y TIL Homosexuality has been decriminalized in France since 1791
X0p46 TIL of operation Abscam: an FBI sting operation in the late 70s which resulted in the resignation of 1 US senator and 5 US congressmen and the expulsion of a 6th congressman for corruption. Congress made it impossible for the FBI to run similar sting ops in the future (Civiletti Guidelines, 1981)