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    This Is How to Check Whether Spacetime Is Foamy

    by Bruce Dorminey Feb 12, 2016 3 minutes

    n 1944, John Wheeler received a haunting postcard. It was from his younger brother, Joe, who had written only two words: “Hurry up.” Wheeler was involved with the United States’ atomic weapons effort, and Joe wanted him to finish the bomb so he could come home from fighting in Italy. But by the time Hiroshima was hit, Joe had already been killed. Not being fast enough to save his brother led Wheeler to become obsessed with time and then General Relativity—Einstein’s theory linking space

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