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TIL about Fairy Rings. Naturally-ocurring rings or arcs of fungi that are frequently found in forestal areas, and they also have been formerly linked to witches or the Devil in old folklore or

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V41Z TIL that there is an optical illusion called the McCullough Effect that is so powerful, ten minutes of exposure can cause you to see colors that are not there for up to a month.
OoKo1 TIL that in Chinese/Peking Opera, a character wearing armor with flags on his/her back was meant to represent a general leading an army. Two such characters fighting on stage meant that a battle between two armies was taking place.
D19eg TIL South African mercenaries were hired in the fight against Boko Haram
N7WGN Today I Learned that there will be a Red Nova in our skies in 2022. This will be the first Nova we can see with the naked eye in decades.
6RK8 TIL A WWII messenger pigeon named GI Joe was awarded a bravery medal for “Making the 20 mile flight from British 10th Army HQ, in the same number of minutes … just in time to save the lives of at least 100 Allied soldiers” 31 other pigeons have been awarded for bravery during service.