How Does Time Travel Really Work, Sean Carroll?

Caltech's Sean Carroll took time off from his work to answer a few questions about time travel that we have seen in the movies. If nothing else, this news article gets a chuckle or two. For example:

"Superman" (1978 version)

How time travel is achieved: Superman zips into space and flies faster than the speed of light, round and round, reversing the planet's spin and reversing time.

Carroll says: "It would cause earthquakes and kill millions. And really, if you can do this, then why, if you're Superman, don't you do this all the time? He should be held to a higher standard."

:)

Zz.