In a gun-type bomb, Uranium-235 is the fuel. In an implosion bomb, Plutonium-239 is the fuel. A fusion-boosted atomic bomb uses the implosion design, with the addition of gaseous tritium (Hydrogen-3). Producing the appropriate amounts of fuel for bombs is expensive, time-consuming, and difficult.
What does an inhibitor switch do? An inhibitor switch basically tells your vehicle whether its in motion or in park. It can tell the car to park or to go into first gear etc.
Also, didn't mean to alarm anyone! It's not like a drive around all the time with the engine off - Just wanted to rule out if it was engine related or not, this was on a empty straight road for a few seconds to see if it still occurred or not. (Not as bad as my old Accord which developed the well documented Ignition Switch problem )