It doesn't matter what Hans Rosling, professor of international health at the Karolinska Institute, is talking about... From GDPs to STDs, he can make any statistics engaging. His TED talks are legendary. He can take what's happening in the world and turn it into digestible information on a computer screen, but this time his most impressive statistical representations weren't just on the screen, but on the tabletop.

At the opening plenary of the Skoll World Forum 2012, Rosling stacked toilet paper rolls to show us a model of why populations will still continue to grow for a few generations even once birthrates even out at two children per family and he challenged the notion that we have an ever increasing overpopulation problem. Hotel toilet paper has never been put to such good use. His most tweetable line: "We're all debating when we've reached peak oil, but we know we're reaching peak child".