Get ready to have your mind bent. It seems that what happens to an atom in the present can change its past. As if the bit about photons changing as a result of the mere fact of being observed wasn't weird enough. According to the article, a team of physicists at the Australian National University "showed that if you offer a speeding helium atom two possible paths, the route it takes appears to be retroactively determined by the act of measuring the atom at the end of its journey." No one is quite sure what all this means yet. "If you ask 10 people, you'll get 11 opinions," says Radu Ionicioiu, of Bucharest’s Horia Hulubei National Institute for Physics and Nuclear Engineering: https://cosmosmagazine.com/physical-sciences/time-travel-and-single-atom
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