July 10, 2017 6:22 AM Subscribe
Many people have heard of entanglement, an idea from quantum physics where two particles are connected in such a way that affecting one affects the other instantly, no matter where in the universe it is located. (Entanglement probably deserves to be called more than an idea since it has been tested over and over again to plug loopholes that might show the particles are actually interacting on a local level in some way, in spite of what seem to be vast distances.) But what if causality could be shown to work retrospectively somehow? Imagine if a particle could carry the effect backwards in time to when it was in very close proximity to its partner. No faster-than-light messages across the universe would be needed. Just backwards in time is all. Say hello to retrocausality! Previously.
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