March 27, 2013
Einstein was still alive. It was the 1953 era. I was an adolescent and received a watch as a present. The underside was written: “Do not to leave the watch near magnetic items since it could alter its performance”. Thus I believed: there are physical phenomena that hinder the performance of watches. About twenty years after Hafele and Keating, who made the famous experiment where they travelled for a long distance around the Earth with atomic clocks, leaving other identical ones on the ground, they showed that gravitational forces (and inertial differences) modified the performance of clocks...
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