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TIL that during a trip to Moscow, then Vice-President Richard Nixon was exposed to high levels of ionising radiation while staying at the US ambassador's residence. After Secret Service agents loudly complained the next day, radiation levels dropped.

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woYxJ TIL that Canada's Stay Alert, Stay Safe campaign, featuring Canada's answer to McGruff the Crime Dog, Bert and Gert the Bunnies, got started because the creator's daughter was the victim of a deadly kidnapping, like with Adam Walsh and Code Adam
R7wVa TIL Huge warthog getting "spa treatment" from mongooses in win-win symbiotic relationship called mutualism. Warthogs living in Uganda have learned to rid themselves of annoying ticks by seeking out the grooming services of some accommodating neighbors: a group of mongooses looking for snacks.
Wbgo TIL that the new Toyota Mirai is one of the first fuel cell vehicles being sold commercially and uses hydrogen to run, while emitting water vapor.
Wklb9 TIL after Libertarians from the Free State Project took over the tiny town of Grafton, NH, their municipal budget-cutting and disregard for local wildlife caused bears to become fearless. That led to 3 separate bear attacks.
4XLeb TIL the Haskell Free Library is the only library to operate in 2 countries on the US/Canada border. It has 2 entrances, one on each country and is a transnational space where citizens from both countries can enter without a passport.