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Time travel is not forbidden by the laws of nature - but to build a time machine, we’d need to understand more about those laws and how to subvert them than we do now. In this film Horizon meets the scientists working on the cutting edge of discovery - men and women who may discover how to build wormholes, manipulate entangled photons or build fully functioning time crystals; in short enable an engineer of the future to do what we have so far been only able to imagine - To build a machine that allows us travel back and forward in time at the touch of a button. It could be you! Science fiction? Watch this space.