Scientists discover that large amounts of nitrogen could be hidden in the Earth's metallic core, which would solve a ...

A study found that we have overestimated how much nitrogen enters natural ecosystems from the air. It has climate ...

This story appears in the May 2013 issue of National Geographic magazine. N. Nitrogen. Atomic number seven. Unnoticed, untasted, it nevertheless fills our stomachs. It is the engine of agriculture ...