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Well, it's not exactly perpetual motion or energy, but it's getting closer than most such attempts. Plus, instead of being backed by some sort of random crackpot scientist, this particular project has the backing of NASA and the U.S. Navy. So, what is it? (Take a deep breath.) The Sounding Oceanographic Lagrangrian Observer Thermal Recharging (SOLO-TREC) autonomous underwater vehicle. Says Jack Jones, a JPL principal engineer and SOLO-TREC co-principal investigator:

How fast would a Prius need to be traveling in order to launch itself into orbit? Really, really fast. Although NASA currently has no plans of attaching rockets to a Toyota any time soon (as far as we know), they will soon be sending a hybrid spacecraft into space. The Prius has a gasoline engine and an electric motor. The Dawn spacecraft has a Delta II Heavy rocket and three Solar Electric Propulsion Technology Applications Readiness engines. Put more simply, it has an ion engine. Take a look a