Spaceships pushed by LIGHT – the future of space travel?

This is another sci-fi space propulsion scheme which has zero chance of ever actually being used.  Also, the radiation pressure effect has nothing to do with photons having momentum.  They have no momentum and do not transfer any momentum to a "light sail".  The sail will feel a pressure acting on it, but it's not from any momentum being transfered to it from incident photons.  There is another mechanism at work that this "educational" video does not mention (and most likely of which its creators are unaware).