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>> elisabeth: nitrogen? i dont know. >> brian: nitrogen. >> the answer is a, nitrogen and you are right. >> brian: wow! >> elisabeth: thats what we said. >> brian: i like the family feud style were adopting. >> i like it, too. it makes up 78% of the earths atmosphere and oxygen, 21%. carbon dioxide, only 0.039%. >> steve: thats a brilliant trivia question because people go, well, its got to be oxygen because thats what we breathe. >> or everybody talks about climate change and carbon dioxide, bu...