David Christian: The history of our world in 18 minutes
7 Billion: How Did We Get So Big So Fast?
How much information can the world store, communicate and compute?
Hans Rosling's 200 Countries, 200 Years, 4 Minutes - The Joys of Stats
Interactive infographic from Newsweek
Interactive music video with input from real-world weather conditions. (via @brainpicker)
Bobby McFerrin demonstrates the pentatonic scale using audience participation.