Heart transplants, rovers on Mars, bionic appendages... yet, as a species, we cannot create a vehicle or aircraft that operates on something other than sweet crude? Give me a BREAK! The technology has been around for decades. Sounds like big oil has a gun to the government's head if they allow such taboo to pass and be manufactured. Yet we still have thick-skulled individuals bashing the "tree-huggers" LOL! Ahh BP.