"Because we can."
(http://www.cs.siue.edu/hci/trilobite.jpg)
Check out recent stories of robot vaccum cleaners:
Robot Vacs in the House:
http://www.wired.com/news/technology/0,1282,59237,00.html (http://www.wired.com/news/technology/0,1282,59237,00.html)
The New Pet Craze: Robot Vacs
http://www.wired.com/news/technology/0,1282,59249,00.html (http://www.wired.com/news/technology/0,1282,59249,00.html)
Don't you just love the title of this thread? Very Asimov...
When I first saw this thread I thought it was going to contain a dirty joke. Get it- vaccum cleaners... dirty? OK, OK, not funny... :-P