Gary’s Q&A

Listener question & Gary’s response · Transcript passage

GongKing asks, Do you think time travel will ever be invented? How will the grandfather paradox be solved if we indeed invent time travel?

There are all sorts of different theories of time travel that people have thought of via science fiction. If the version of time travel is one that lets you go back in time to any point, then I don’t think that will ever happen because if it were to happen, we’d have evidence of it. There could, theoretically, be a form of time travel where you could go back to a particular point that was established beforehand. So if we made a time travel device, we probably couldn’t go back further than the creation of the time travel device.

That being said, it is entirely possible I’m wrong, and time travelers have already come back in time under controlled circumstances. But if that did happen, the question we have to ask is, why didn’t they kill Baby Hitler?