"LiquidMetal Demo"
GoogleVideo
"Demonstration of increased energy return efficiency in exotic elastic metal alloys."
video 1:44
Despite the name, LiquidMetal is an exotic sort of metallic glass, a substance with very high elastic strength.
Impressive demonstration. And yes, the ball bouncing on LiquidMetal does eventually stop bouncing.
There's a bit more about metallic glass at "Metallic glass: A drop of the hard stuff" (NewScientistTech (April 2, 2005)).
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