I can assure you that no string theorist would be interested in working on string theory if it were somehow permanently beyond testability. That would no longer be doing science.

Art makes us human, music makes us human, and I deeply feel that science makes us human.

The beauty of string theory is the metaphor kind of really comes very close to the reality. The strings of string theory are vibrating the particles, vibrating the forces of nature into existence, those vibrations are sort of like musical notes. So string theory, if it's correct, would be playing out the score of the universe.

Assessing existence while failing to embrace the insights of modern physics would be like wrestling in the dark with an unknown opponent.

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

I've seen children's eyes light up when I tell them about black holes and the Big Bang.

...quantum mechanics—the physics of our world—requires that you hold such pedestrian complaints in abeyance.