This graph was fairly simple, but its implications were monumental. Unlike any image before, it showed that Earth’s temperature had been relatively stable for 500 years, only to suddenly spike ...

"Search problems are very long tail," Jack Menzel, Google's product management director for search, told me. So for now, hitting a Knowledge Graph results, while delightful, is rare.

Click play icon to see the graphs over time. The data for the graph can be found in the Organisation for Economic Co-operation and Development's Health Data 2009 site. Close.