As the fins tap the energy generated by the up-and-down motion of ocean waves, they move to propel the robot at speeds of up to 2 knots.

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"Any mechanical motion, such as the movement of arms or the fingers of a robot, could be translated to control signals, " said Zhong Lin Wang, a professor at the Georgia Institute of Technology.

BBC: Sensors

What's most striking about Fujitsu's little robot is its simplicity--in a sense, it's merely a camera with a motion sensor atop a base that contains two wheels.

FORBES: Magazine Article