Yes, and just because one, or two, or "X" number of attempts don't work doesn't "prove" it's impossible (was it Edison who tried about 1000 different things before he finally got the light bulb to work?).
But on this HHO business, it sounds like the "trick" hasn't been discovered yet. Maybe it will be, and major kudos to those who soldier on and keep working on it. But for me, I'm gonna be concentrating on the "low hanging fruit" because I'm - well - lazy, to be blunt. ;-)
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