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TIL that carrier pigeons only know how to fly back to their home base. The infrastructure that supported this messaging system required regular deliveries of birds between cities and regular release of the birds so they did not imprint on a new location.

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wo6M6 TIL bees will leave the hive with all their honey (abscond) if they (for various reasons) feel uncomfortable with their living situation, even if it means certain death from being exposed to the elements.
5Y7Xp TIL of Oak Ridge, a city built in the U.S. in 1942. 100,000 people lived and worked there doing very specific tasks, most of whom with no idea of what they were working towards. In 1945 they saw news reports of the atomic bombings of Japan and realised they’d been working on the bombs all along
8eeO4 TIL That "Barker’s Beauties," the models on The Price is Right, did not have contracts, but were were rehired on a week-to-week basis to keep their salaries low.
epld5 TIL: In a research study, women who were presented with images of “slim-thick” women reported greater dissatisfaction with their weight, appearance, and overall satisfaction with their own bodies compared to those who viewed “thin-ideal” imagery.
QJyx6 TIL the dodo bird was not unintelligent but simply evolved docile behavior in response to a lack of predator on its native island of Mauritius. Humans took advantage of this behavior, haunted it to extinction, and then made it a universally recognized symbol of unintelligence.