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Why Do Cats Almost Always Land on Their Feet — How Do They Turn With Zero Angular Momentum?

지붕 가장자리에서 뛰어내리는 고양이의 실루엣 사진, 몸이 공중에 뻗어 있다

Do cats really always land feet-first? The secret of the falling cat, which reorients itself despite zero angular momentum, lies in having a body that is ‘not rigid.’ From Marey’s 1894 chronophotography to angular momentum conservation and the bend-and-twist mechanism, the tail myth that Manx cats disprove, and the unexpected twist in high-rise fall statistics.

Why Do Stars Twinkle But Planets Don’t

천문대 관측돔 위로 펼쳐진 은하수와 별이 총총한 밤하늘

Starlight and planetlight both cross the same atmosphere, yet one flickers and the other stays steady — the difference lies in the turbulent air above us and each object’s tiny apparent size.