cf. https://en.wikipedia.org/wiki/Grandfather_paradox
In the usual EPR-type experiment, a particle A is sent westward and "correlated" particle B is sent eastward. (A could travel 5 miles and B could travel just 5 feet, for example.) But their detection outputs show that A and B are "entangled" so that apparently the detection setups at both ends influences the "final" states of A and B. In another EPR-type experiment, an emitter sends one particle A "skyward" into space, and simultaneously a twin particle B to a detector nearby. Depending on what the B detector measures, an unlucky grandfather is killed or not. The A particle bends around a massive object (its path bent by general relativity - it could also be more than one massive object involved in its travel) light years away and returns to Earth 30 years later when that grandfather's grandchild has set up a detector for A whose measurement results in the grandfather's death. - pt -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at https://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
