[Steve_Seattle]

"Amazing how few people know that nitrogen is the most common gas in the atmosphere."

Not really. We breathe oxygen, after all, and carbon dioxide is in the news all the time, but no one ever talks about nitrogen.

[W.]

I don’t get it, either. Nitrogen gas in quantity displaces oxygen, and is considered an asphyxiation hazard. If we breathe a mixture consisting of more nitrogen gas than oxygen, we’d keel over, eventually, yes?