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TIL when there's merely a suspicion of testicular cancer in a man, a testicle must be removed in almost every case, so a biopsy can be performed after the fact, and doctors can assess if the cancer has spread.

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xnAb TIL of Roy Sullivan, a man who was struck by lightning seven times. He started to believe that he attracted lightning, and sometimes even reported seeing clouds following him. He eventually shot himself in the head at age 71.
wL80M TIL that in 1926, due to the near eradication of predators, 50 million mice flooded into Taft, CA- a 20,000 to one mouse-to-person ration. There were so many mice, that the roadkill from mice on streets made roads too slick for cars to drive on.
4DRa TIL there is a parasite which breeds inside the guts of a cat. Their offspring are deposited in droppings and can then be eaten by rats. The offspring then affect the rats’ behaviour to make them less scared, and even sexually aroused, by cats, with the aim of returning to the cat guts
nWvk9 TIL that butterflies have 4 wings not 2 (found out on an episode of Benidorm during a pub quiz)
69gyQ TIL about the Battle of Jaffa, whereby the Crusaders leader King Richard I and the Muslim defender Saladin would meet in battle for the decisive time. Richard I ultimately won but both sides left with complete respect for each other.