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angry tapir writes "Scientists are developing a robotic jellyfish which uses the limitless energy of sea water to power its movement. US Navy-backed research, published on Wednesday, says "Robojelly" mimics the action of the jellyfish, which uses a circular muscle to open out a bell-like body and then sharply close it, which expels water and moves the creature forward. The robot's body comprises eight segments made of shape-metal alloy — metals that remember their original shape after being scrunched up. They are coated with a platinum black powder, which reacts with the oxygen and hydrogen components of sea water to create heat." Link to Original Source
Never worry about theory as long as the machinery does what it's supposed to do.
-- R. A. Heinlein