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TIL that the Norweigan resistance during WW2, after having their entire sardine catch requisitioned by the Nazis, took revenge by spiking the sardines with croton oil which is an extremely powerful laxative. Britain was so impressed by this that they followed suit by also spiking German supplies

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698W7 TIL going to the beach and swimming in the ocean for leisure is a relatively modern practice in the western world. Prior to the 17th century, Europeans historically viewed beaches as frightening places, and "only peasants sought refuge from the heat in the cool seawater".
rN5eM TIL the song ‘Good Hearted Woman’ by Waylon Jennings (and Willie Nelson) was written from an article headline about Tina Turner and her troubled relationship with Ike Turner. Tina went on to record a cover version of the song in 1988.
v1e0j TIL of the Eidophone, an instrument which created images from the interaction of voice and materials. Inventor Margaret Watts-Hughes, a Welsh singer, was working with a device similar to Bell's Photophone when she noticed perfect geometrical patterns formed according to clarity and calibre of voice.
XED68 TIL Killer-whale mothers often stay with their adult sons for their entire lives, sharing their prey and knowledge, & that the mother's might also play a direct role in fostering mating opportunities. They really want grand children.
WkmaY TIL That a study had participants eat cookies labeled as regular and organic. Participants preferred the organic option based on taste and thought the cookie must be lower in fat and calories. They were also willing to pay more for the organic one. The two cookies were 100 percent identical.