"BlueBiped, the Passive Walking Robot has no motors, no sensors,
no power source, yet in a test last year it was able to walk around
15km in 13 hours. The robot is a set of aluminium legs with the same
weight and proportions as human legs. Created by Nagoya Institute
of Technology in Japan, the legs are given a slight push and they can
walk with a human gait, using their own weight, down a slight slope.
Like humans, the robot walks by falling forwards"

http://youtu.be/rhu2xNIpgDE

http://www.extremetech.com/extreme/101525-bluebiped-a-human-like-walking-ro=
bot-that-requires-no-power-source

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