TED: Massimo Banzi: How Arduino is open-sourcing imagination - Massimo Banzi (2012)

Summary: Massimo Banzi helped invent the Arduino, a tiny, easy-to-use open-source microcontroller that's inspired thousands of people around the world to make the coolest things they can imagine -- from toys to satellite gear. Because, as he says, "You don't need anyone's permission to make something great."