"Is Time Travel Possible? | The Science of Doctor Who" https://www.youtube..com/watch?v=-O8lBIcHre0

"Time goes slower for you than for the people you left behind... [...] Professor Brian Cox demonstrated this idea during a BBC Doctor Who special, using a member of the audience to help – Professor Jim Al-Khalili. He set up the Professor in a moving chair across the stage, with a beam of light moving up and down. "Moving clocks run slower – this is true – time really did pass at a different rate for Jim than it did for you.. There is no sleight of hand here, Jim really is a time-traveller." https://newsflash.one/2019/05/10/tim...-its-possible/

There is a huge sleight of hand here. According to Einstein's special relativity, Jim Al-Khalili, the space-traveler, sees his clock running FASTER than stationary clocks, and therefore he is no time-traveler at all:

David Morin, Introduction to Classical Mechanics With Problems and Solutions, Chapter 11, p. 14: "Twin A stays on the earth, while twin B flies quickly to a distant star and back. [...] For the entire outward and return parts of the trip, B does observe A's clock running slow..." http://www.people.fas.harvard.edu/~djmorin/chap11.pdf

"The situation is that a man sets off in a rocket travelling at high speed away from Earth, whilst his twin brother stays on Earth. [...] ...the twin in the spaceship considers himself to be the stationary twin, and therefore as he looks back towards Earth he sees his brother ageing more slowly than himself." http://topquark.hubpages.com/hub/Twin-Paradox

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