had an episode on time travel Thursday.

I think Discovery has a show on time travel as well.

I don't see how it would be possible to travel either backwards or forwards in time unless you could hitch a ride on some particle that travels through time....maybe some unknown particle that was created when the universe was made and that travels back and forth in time.

Of course ..if parallel universes exist..another Discovery channel show if I recall correctly....maybe it's still WW1 in the other universe and you could kill Hitler during WW1..shoot him in his trench in France and he would never become the Fuhrer and you could spare that universe his future actions.

That might help that other universe but wouldn't have affected events in ours.