Just to be clear, hydrogen is a great fuel, though dangerous. (See Hindenburg for examples). You cannot fuel your vehicle with the garden hose if it runs on hydrogen. You must fuel it with, get this . . . . . . hydrogen. Water vapor is what comes out of the exhaust pipe as a by-product of combustion with the oxygen in the air, the molecules bond to form good old H2O. What it probably works on is hydrogen fuel cells. My dad is a chemical engineer and he works on stuff like this, but I'm a history teacher, so I don't get it.
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