Time travel, with Lawrence Krauss
Instant Genius
00:00
The Grandfather Paradox
Some sci-fi writers have tried to get around that problem by using wormholes. But in science, I don't think that really flies because first of all, you have to have another universe. They're causally disconnected from us and there's nothing we can do in our universe that impacts on those other universes or vice versa. And frankly, if a wormhole were to connect those universes, then you could cause the impact on one another. So it just pushes the problem away a little bit.
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