1.   He predicted that if technological developments maintained their current momentum, it would soon become possible to use sunlight to derive hydrogen fuel from water.

2.   A Ballard Fuel Cell converts natural gas, methanol, or hydrogen fuel into electricity without combustion.

3.   Hydrogen fuel cells produce energy by electrochemically combining hydrogen fuel with oxygen from the air.

4.   Images of the burning Hindenburg are called to mind whenever critics assail proposals for using hydrogen fuel in automobiles.

5.   In the first thermonuclear method, the core of a small atom bomb is filled with hydrogen fuel.

6.   In theory, the amount of hydrogen fuel ignited by the two-stage method has no limit.

7.   In theory, the amount of hydrogen fuel ignited by the stage method has no limit.

8.   Midway through the flight, shuttle engineers released photographic evidence of a small leak of explosive hydrogen fuel from the exhaust nozzle of the right engine.

9.   The breakthrough idea, known as radiation implosion, was to build a large cylindrical casing that would hold the atomic bomb and hydrogen fuel at opposite ends.

10.   The engine works by injecting the hydrogen fuel into a chamber where it is bombarded by radio waves.