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Retrocausal: Solutions to the equations of Einstein's general theory of relativity known as closed time-like curves (CTCs) seem to allow a system’s trajectory to return to a previous point in time.

Aliza Chasan is a Digital Content Producer for "60 Minutes" and CBSNews.com. She has previously written for outlets including PIX11 News, The New York Daily News, Inside Edition and DNAinfo. Aliza ...