One of the great things about running a blog is that when you write about something interesting that you know little about, readers rush in with a wealth of further information. Contrarian friend Andrew Weissman directed us to an extraordinary TED talk by Hans Rosling illustrating the phenomenal potential of the digital graphs we touched on this morning. Rosling is a professor of international medicine at Sweden's Karolinska Institutet (the organization that hands out the Nobel Prize for Medicine). He discovered Konzo, a previously unknown paralytic disease associated with hunger in Africa. He also co-founded the Gapminder Foundation, which developed the...