Quote

In the future, maybe quantum mechanics will teach us something equally chilling about exactly how we exist from moment to moment of what we like to think of as time.

The bottom line is that time travel is allowed by the laws of physics.

Time can behave like another direction in space under extreme conditions.

There was a long history of speculation that in quantum gravity, unlike Einstein's classical theory, it might be possible for the topology of spacetime to change.

If you have a wormhole, then you can turn them into time machines for going backward in time.

You've got to always go back in time if you want to move forward.

First of all, we have to go back to the classical time control.

I find the whole time travel question very unsettling if you take it to its logical extension. I think it might eventually be possible, but then what happens?

Particle physicists may freeze a second, open it up, and explore its dappled contents like surgeons pawing through an abdomen, but in real life, when events occur within thousandths of a second, our minds cannot distinguish past from future.

In spacetime, all events are baked together: a four-dimensional continuum. Past and future are no more privileged than left and right or up and down.