Michael Pritchard: How to make filthy water drinkable
Too much of the world lacks access to clean drinking water. Engineer Michael Pritchard did something about it -- inventing the portable Lifesaver filter, which can make the most revolting water drinkable in seconds. An amazing demo from TEDGlobal 2009.
Matthew Borths, Michael D'Emic, Adam Pritchard: When will the next mass extinction occur?
About 66 million years ago, a terrible extinction event wiped out the dinosaurs. But it wasn’t the only event of this kind -- extinctions of various severity have occurred throughout the Earth’s history — and are still happening all around us today. Borths, D'Emic, and Pritchard give a quick history of mass extinctions. [Directed by Juliette Mar...