kangaroo
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Make all the jokes you want, but the methane emitted in the form of cow burps and farts is actually a major source of greenhouse gas emissions. That could soon change, however, thanks to bacteria found in baby kangaroo feces.
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Just like its animal cousin, Festo's BionicKangaroo is able to store energy from the landing phase of a jump and reuse it efficiently for more jumps. The technology may hold the key to more energy-efficient machines based on both pneumatic and electric drive technologies.