What is time?

March 07, 2010

[Y]ou can't define a consistent arrow of time if you can go into the past. Because what you think of as your future is in the universe's past. So it can't be one in the same everywhere. And that's not incompatible with the laws of physics, but it's very incompatible with our everyday experience, where we can make choices that affect the future, but we cannot make choices that affect the past.

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