TL;DR – Time loops don’t really work. Either they degenerate into sources of infinite mass or they violate thermodynamics. My last thought experiment on time travel struck a chord. “Surely, you must know about wormholes!” someone assailed me. “You could go through a black hole and come out in a totally different era!” “There could …

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TL;DR – Time travel violates physical laws way before you get to the point where you can kill your own grandfather. A person bumped into me the other day. “Time travel has always fascinated me,” he said. “Is it possible? Could we go back in time and kill Hitler and prevent Nazism? There are so …

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