If light takes the path with the least time between two points, and light beams bend under the influence of gravity, then the shortest distance between two points is a curved line. Einstein was shocked by this conclusion: If light could be observed traveling in a curved line, it would mean that space itself is curved.

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Quote text and notes from Wikiquote: Michio Kaku (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.