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TIL the BBC created a Radio Soap Opera during WWII specifically for the American market. It was propaganda designed to get the USA to end its neutrality. One of the aims of the show was to appeal to those with a 'limited mentality'. It ended up being a popular radio show in the US.

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E1EAX TIL tears contain leucine enkephalin, a natural pain killer, which is suggested to be the mechanism behind the experience of crying from emotion making an individual feel better.
9YVNQ TIL of the 'Illusory truth effect', the tendency to believe information to be correct after repeated exposure. The illusory truth effect has played a significant role in such fields as election campaigns, advertising, news media, and political propaganda throughout world history.
nW7oW TIL: Hammerhead sharks are only around 20 million years old. Despite most modern species keeping the same basic game plan for 300m+, this body design is fairly new to the evolutionary scene. Oh, and they can see 360° 🔨🦈
R57W8 TIL analysis of fish caught in giant water surges occurring immediately following the meteorite impact which caused the KPG extinction event, ending non-avian dinosaurs, show this may have happened in boreal spring; austral autumn—contributing to the death of species coming out of hibernation
jNjGQ TIL William James saw the "social self" as a self each person has that adapts to the social context of a group, meaning that it's observable to behave differently in group situations and even within differing groups