Meet roboticist Colin Angle in these videos from NOVA's "The Secret Life of Scientists & Engineers." He explains his early interest in robotics and why he makes them. Colin invented the Roomba, the device that vacuums your floor. In his spare time, he is an extreme athlete who thinks that rocks are for climbing, oceans are for sailing, and mountains are for cold-weather launching pads. This resource is part of the NOVA: Secret Life of Scientists & Engineers Collection.