Here's a modular robot from the University of Pennsylvania that can reassemble itself after being kicked into pieces. This is the second video I've seen of a robot that responds in a surprising way to its master's kick. The first video was of the Big Dog pack robot.
Mark Frauenfelder is the founder of Boing Boing and the editor-in-chief of MAKE and Cool Tools. Twitter: @frauenfelder. His new book is Maker Dad: Lunch Box Guitars, Antigravity Jars, and 22 Other Incredibly Cool Father-Daughter DIY Projects