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TIL that pregnancy starts from the last 'normal' period of the mother, so when you would normally discover a pregnancy from a missed period, there is only ~8 months left, not 9.

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Z84go TIL that the Inca Road system was at least 40,000 kilometres (25,000 mi) long. The roads were carefully planned and maintained. They were paved where necessary, had stairways, bridges and constructions such as retaining walls and a drainage system. Only 25% of the system remains visible today.
6E4Ww TIL that the "International Journal of Advanced Computer Technology" once accepted for publication a research paper consisting entirely of the words "get me off your fucking mailing list" repeated hundreds of times. They rated it "excellent".
yQGKe TIL that President John F. Kennedy's younger sister, Rosemary Kennedy, was diagnosed as mentally deficient and forced to undergo a lobotomy. She was strapped to a table against her will and lobotomized, permanently incapacitating and institutionalizing her until her death in 2005.
b9p7Z TIL Nancy Wake was a secret agent during WWII. In 1944, she led 7000 guerrillas to defeat 22000 German soldiers, killing 1400 Germans and only losing 100 men. They accounted for 70% of the Germans killed by the French resistance, yet their fatalities made up only 1% of the French resistance deaths.
oBYgL TIL the reason most films end with the “This is a work of fiction [...]” disclaimer is a 1933 Rasputin biopic. The prince responsible for his murder sued the studio, claiming that the production did not accurately depict the murder