Although the technology to do so does not (yet) exist, this doesn’t stop theoretical physicists from contemplating the nature of time travel. One speed bump in the theory of time travel has always ...

Hungarian logician, mathematician and philosopher Kurt Gödel revolutionised our view of mathematical truth with his incompleteness theorems. He also drew up the blueprints for a working time machine.

Depending on how well my time machine worked, there are others I’d like to meet. Aristotle, Michelangelo and Leonardo DaVinci, for example. Abraham Lincoln, Theodore Roosevelt and Thomas Edison would ...