BoingBoing reader Mack says:
Excellent pictures on this site! A USC roboticist has created a robot that can build large structures by extruding semi-liquid material from a pump in inch-thick layers to form a wall or a building, and then return to fill in the hollow wall. This looks like a macro version of 3-D prototyping in that you could essentially set up a machine, fill it with the right goo and programming, switch it on, and have a house in a few hours that was built completely without the intervention of human hands.
Link to National Science Foundation press release, and Link to an overview with more links on Mack's blog.
