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I'm very confused. This article repeatedly refers to "lighter" isotopes of Oxygen--but then calls those lighter isotopes Oxygen-superscript-18. I think that O-16 should be lighter than O-18, but I certainly don't have a reference for this bit of sky-being-blue. What's going on????? — Preceding unsigned comment added by 220.127.116.11 (talk) 17:50, 8 September 2014 (UTC)