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    Why a cat always lands on its feet

    This is the first live cat recorded on film, and it’s being dropped to solve a physics problem: Why do cats always land on their feet? It’s a question that was driving 19th-century scientists nuts. Until one of them used an unexpected tool to solve the mystery: a camera. Étienne-Jules Marey was an obsessive scientist and inventor who analyzed how things moved. And he started experimenting with photography at a time when the medium was mostly used to document static subjects. But his goal was to capture motion. And he did that by building on a basic principle of photography: exposing a photosensitive material to light and then covering it…