MrSeb writes: "Today’s groundbreaking entry into the Uncanny Valley is a pair of mechanical, robot legs that are propelled entirely by their own weight: they can walk with a human-like gait without motors or external control. Produced by some researchers at Nagoya Institute of Technology in Japan, all the legs require for perpetual motion (they walked 100,000 steps, 15km, over 13 hours last year) is a gentle push and a slight downwards slope. They then use same "principle of falling" that governs human walking, with the transfer of weight (and the slight pull of gravity), pulling the robot into consecutive steps." Link to Original Source
"Don't try to outweird me, three-eyes. I get stranger things than you free
with my breakfast cereal."
- Zaphod Beeblebrox in "Hithiker's Guide to the Galaxy"