The laws of physics seem to allow time travel, but no one has had much hope of building an actual time machine because it would take such exotic conditions and materials.
Now, physicist Amos Ori of the Technion Israel Institute of Technology in Haifa has come up with a potentially more practical time machine design. Unlike most previous proposals, this one requires only normal matter and the vacuum known to exist in space, says Ori.
So, if you could go back, when and where? What would you do?