psyph3r writes: Dailymail.co.uk has published an interesting article written by Stephen Hawking on the practicality of time travel. He covers wormholes and approaching the speed of light as methods of time travel. He also covers current evidence that the passage of time is not constant, but varies based on conditions such as gravity (GPS satellite time loss) or velocity (LHC time dilation) He then expands on this proof into possible and impossible ways for humanity to travel through time. Long article, but a recommended read.
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