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3In his late twenties, Einstein was similarly inspired by a sensory intuition to develop his theory of general relativity, which explains gravity in terms of how mass causes curvature in space and time. “I was sitting on a chair in my patent office in Bern,” he recalled. “Suddenly a thought struck me: if a man falls freely, he would not feel his weight.” This kinesthetic insight led directly to the idea that gravity and acceleration are indistinguishable, which he developed over the following years into the full theory of general relativity.
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