A beginner's guide to time travel
Everyone can travel in time. You do it whether you want to or not, at a steady rate of one second per second. You may think there's no similarity to traveling in one of the three spatial dimensions at, say, one foot per second. But according to Einstein's theory of relativity, we live in a four-dimensional continuum — space-time — in which space and time are interchangeable.....
Everyone can travel in time. You do it whether you want to or not, at a steady rate of one second per second. You may think there's no similarity to traveling in one of the three spatial dimensions at, say, one foot per second. But according to Einstein's theory of relativity, we live in a four-dimensional continuum — space-time — in which space and time are interchangeable.....