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TIL: The top (summit) of Mt Everest is grey limestone, complete with embedded marine invertebrate fossils (e.g. trilobites). This means that the rock that makes up the top Mt Everest was once underwater.

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b9al4 Today I learned that non-spayed female ferrets will die if they don't have sex. They go into season and don't come out until they have mated, and the associated elevated oestrogen levels eventually cause anemia and death.
VMZ0k TIL that during the Siege of Syracuse (213-212 BC), Greek mathematician Archimedes refused to abandon the geometry equation he was working on during a battle. His last words before being killed by a Roman soldier were: “Don't disturb my circles!”
BvYk TIL potatoes absorb Wi-Fi signals the same way people do, and are used to test/improve internet signals on airplanes.
LQ60 TIL that ostriches sometimes kill lions instead of trying to outrun them.
Bewb TIL that tennis player Vitas Gerulaitis lost 16 consecutive times to Jimmy Connors. When finally beating Connors on their 17th meeting, he said “And let that be a lesson to you all. Nobody beats Vitas Gerulaitis 17 times in a row”