Research the grandfather paradox without murdering your grandfather

The grandfather paradox is well-known and has a good dramatic hook, but it's a rather ineffective controlled experiment. The Polchinski Paradox gives us a time travel paradox based purely on laws of motion, without any of that tiresome free will. Plus, it involves billiards. » 8/23/13 7:20am 8/23/13 7:20am

Are we running out of time to kill Hitler via time travel?

Most people here have heard about the Grandfather Paradox. Most people here have also read at least one time-travel story in which people either take out or attempt to take out Hitler. But if we have one, can we possibly do the other? » 8/06/12 8:40am 8/06/12 8:40am

Is The Large Hadron Collider Being Sabotaged from the Future?

What if all the Large Hadron Collider's recent woes are more than bad luck and technical problems? Two noted physicists speculate that the future may be pushing back on the LHC to avert the disaster of observing the Higgs boson. » 10/13/09 11:50am 10/13/09 11:50am

What Happens When You Kill Your Own Grandfather As A Baby?

The moment we learn how to time travel, the first thing we're all going to want to do is go back in time and kill our own grandparents as children. It's like picking at a scab, you can't resist. A big part of the temptation comes from the fact that we don't know what'll happen when you do that — it's the great… » 6/13/08 11:41am 6/13/08 11:41am