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medieval-castle-stairs-were-often-built-to-ascend
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.
about-½-of-your-friends-probably-dont-think-of
About ½ of your friends probably don’t think of you as their friend. Climbing the social ladder causes a lot of one- sided friendships, because those lower on the ladder often claim to be friends with people who are higher up, while those at the top are more selective about who they consider to be in their circle. Basically, no matter where you land on the ladder, you have more fake friendships than you think you do.