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did-you-kno-medieval-castle-stairs-were-often
Medieval castle stairs were often built to ascend in narrow, clockwise spirals so right-handed castle defenders could use their swords more easily. This design put those on the way up at a disadvantage (unless they were left-handed). The steps were also uneven to give defenders the advantage of anticipating each step’s size while attackers tripped over them.
oysters-make-pearls-so-they-can-feel-better-when
Oysters make pearls so they can feel better. When a grain of sand or debris gets stuck in their bodies, they ease the pain and irritation by coating it with multiple layers of nacre, the mineral that lines the inside of their shells, and pearl begins to form. Basically, pearls are like blisters, only much prettier.