A Russian cosmonaut named Sergei Krikalev has physically travelled further into the future than almost any other human being in history — across six spaceflights and 803 cumulative days at orbital velocity, Einstein’s theory of special relativity has made him approximately 0.02 seconds younger than other people his age

Einstein’s special theory of relativity, published in 1905, made a number of strange predictions about how time and motion interact, several of which sounded so counterintuitive that for the next half-century even physicists who accepted the underlying mathematics found themselves uncomfortable with the practical implications. One of those predictions was that time itself does not [...] The post A Russian cosmonaut named Sergei Krikalev has physically travelled further into the future than almos