Sources

 Einstein believed that time travel was possible. See how by following these two sites. [|Site 1] [|Site 2]

What do you think of this Discovery Channel video clip? media type="youtube" key="X02WMNoHSm8" height="344" width="425" Are you convinced?

Does this National Geographic video help? media type="youtube" key="SafwXdP7ylc" height="340" width="560"