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TIL that sperm can remain viable inside a woman's vagina for up to 5 days.

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MZXb TIL that planting swastikas in the forests of Germany was “a fad among National Socialist foresters” during the Nazi period and nobody noticed them until decades later.
m1Y4x TIL that through much of the history of agriculture, threshing was time-consuming and laborious. Until the late 18th century, before threshing was mechanized, about one-quarter of agricultural labor was devoted to it.
e06lk TIL that a brother-sister duo in Iceland would have different surnames. As a surname; the boy gets his father's first name with a '-son' in the end, the girl also gets the father's first name but with a '-dottir' in the end. Ultimately they end up having different surnames.
kJYw1 TIL that Papin invented the pressure cooker in 1679 for extracting gelatine from bones and reducing the time needed to cook food.
Jwk8 TIL Zoos will take donated Christmas Trees and use them to feed their animals.