Can We Colonize Mars?

The history of human migration shows that when we find somewhere we can live, then some people inevitably go there.  The same may probably be true of other planets.  Yet we, as a species, has never gone further than the moon. What of Mars? In this video in the Further series which explores how humanity and science intersects, former NASA Astronaut, Jeffrey Hoffman discusses the mysteries of Mars, and the potential for human colonization.