Is time travel possible? Brian Cox and Nalini Joshi offer their views | Q & A

Brian Cox visits the world's biggest vacuum chamber – Human Universe: Episode 4 Preview – BBC Two

This is Nasa's space power facility near Cleveland, Ohio, and it is the world's biggest vacuum chamber it's used to test spacecraft in the conditions of outer space and It does that by pumping out the 30 tons of air in this chamber until they're about 2 grams left This I've got an eccentric construction. […]