If you weren't already blown away by first two installments, check out this clip on how gravity and space-time interact! Our physicist friends, Pontzen and Whyntie, continue their discussion of these motion concepts for your high...

When a child lets go of a helium balloon, what happens to it? Does it float all the way to space? The simulator allows pupils to experiment on party balloons and weather balloons under different conditions to see what happens to them in...