<http://www.youtube.com/watch?v=bxx14Xe2iNg>http://www.youtube.com/watch?v=bxx14Xe2iNg I assume everyone has seen the quite extraordinary Boston Dynamics BigDog <http://www.youtube.com/watch?v=W1czBcnX1Ww>http://www.youtube.com/watch?v=W1czBcnX1Ww