zekrom 
Fun fact: About half the nitrogen in the average human (and probably more than half in your body if you are living in the "developed world") was fixed not by natural means, but synthetically by the Haber-Bosch process, combining nitrogen and hydrogen under high pressure and temperature with a metal catalyst to produce ammonia. This is probably the single most important chemical process ever developed - it consumes about 1% of the entire world's primary energy production, and without it, the world's population would only be half as large.