Rating is available when the video has been rented.
This feature is not available right now. Please try again later.
Published on Jun 25, 2012
Derek Muller is the Creative Director of Veritasium, a science video blog with 90 films based off of interviews with Australians about issues such as global warming, seasons and the scale of the universe. [Note: We want you to see these talks exactly as they happened! The archive footage might be a little rougher than the usual TED.com talk.]