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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 unknown, mocking us with its unknowability. What do you think will happen? More »
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