That's right... an engine that runs solely on salt water is currently being developed by the US government. Apparently, a scientist looking to come up with a cure for cancer figured out a way to make salt water combustible. You can watch a report on this at
Youtube.
I do have some questions / concerns about this engine, however. Anything that sounds this good usually has some problems that need to be resolved. My question is what kind of byproducts are produced by this reaction. Salt water is composed of very simple materials. Obviously, water is H2O, but salt is composed of Sodium (a material that explodes when it hits water) and Chloride (a lethally poisonous gas). Makes you wonder what kind of exhaust fumes we would be breathing in.
Also, if this development is achieved by the government, will we ever see it come to fruition? Imagine a world in which you can fill your car up at home, where boats don't have fuel tanks, where shipping costs are drastically reduced. I sincerely doubt that our current government would opt for that kind of a world. The fact that this natural resource is so easily obtainable leads to a government with less control of its populous.
I hope that before I die I can drive my car to the ocean and back for free.