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For robots, fuel cells that double as muscles. From CNET.
You know you're living in the future when paragraphs begin 'today's crude humanoid robots...'

Today's crude humanoid robots already use gears, pulleys and pistons to mimic the actions of muscles. But they are electrically powered, requiring that they be plugged in and tethered by an extension cord or powered by batteries, which drain quickly.

Baughman's advance, reported in the current issue of the journal Science, is that his new muscle fibers double as fuel cells. Just like real muscles, they power themselves instead of relying on external electrical power. Chemical energy also delivers a greater bang.