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wolxJ TIL crinoid fossils (a relative of starfish) were found in the rock of the summit pyramid of Everest in 1924, the first proof the mountaintop is marine limestone formed on the ocean bed.
9wkDr 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.
ADnjd TIL Mongols used catapult to send dead soldier bodies infected by the plague across the walls.