Started by Hans Rosling, "the mission of Gapminder Foundation is to fight devastating ignorance with a fact-based worldview that everyone can understand." Screen Shot 2016-02-17 at 11.35.01 PM

This really amazing tool shows many categories of interesting data (concerning population, income, education, economy, environment, etc) since 1800. Each country is a bubble and when you view it in Chart mode at the top you see the different countries' bubbles bounce around, grow in size, etc over the past 200 years.