Part 2 of a pair. After part 1, you might have thought that all different infinite collections of things are the same size. Not so! In this video, Agustin Rayo (M.I.T.) shows us another of Georg Cantor's results: that for every size of infinity, there is a bigger one! An example: there are way more real numbers than there are natural numbers. Help us caption & translate this video! http://amara.org/v/ErQx/