http://www.futureoftech.msnbc.msn.com/technology/technolog/robotic-jellyfish-may-never-run-out-energy-497769The explanation in it did not explain anything, hard to believe it is from mouth of a scientist:
"With the new system, "you don't need any electricity, you just need to have hydrogen and oxygen flow over your actuators," Villanueva told me on Tuesday. "
My puzzle: Sure, where are the H and O from?
"The other cool thing about it is we're going to be swimming in water. What's water? It's hydrogen and oxygen. So you've got an infinite source of fuel," he added."
My response: What? WTF! Who the heck needs oil or solar energy?
Seriously, Water is H and O combined, you need energy to split them, where is that energy from?