Looper: The Science of Time Travel

Brian Clegg, Author of How to Build a Time Machine, looks at the literary history of time travel, the science behind it, and the "rules" of time travel.Brian Clegg, Author of How to Build a Time Machine, looks at the literary history of time travel, the science behind it, and the "rules" of time travel.Brian Clegg, Author of How to Build a Time Machine, looks at the literary history of time travel, the science behind it, and the "rules" of time travel.