In 1943, a U.S. Navy ship reportedly vanished into thin air—then reappeared miles away. Was it teleportation, invisibility, ...

Since nobody showed up to Stephen Hawking's time travel party, we have a few possible conclusions: 1. Time travel into the past is not allowed. Our future descendants will realize a deeper ...

The fact that relativity did not automatically make time travel impossible signaled to Gödel that Einstein's theory was incomplete. Thankfully, we see no signs that we live in a rotating universe.