A Second Class stamp http://sandiegoquitsmokinghypnotherapy.com/wmedicinelv-fd9f.pdf flypharmaconference.com "We measured the amount and isotopic abundances of nitrogen and argon in the ancient air," Marty explained. "Argon is a noble gas which, being chemically inert, is an ideal element to monitor atmospheric change. Using the nitrogen and argon measurements we were able to reconstruct the amount and isotope composition of the nitrogen dissolved in the water and, from that, the atmosphere that was once in equilibrium with the water."
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