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We wore the rings for days and perhaps weeks at any given time, evaluating normal convenience, bulkiness, irrespective of whether we experienced to remove them for certain routines And exactly how they fare in h2o. δ18O=18Rsample-18Rstandard/18RstandardwhereR18=18O/16Oδ17O=17Rsample-17Rstandard/17RstandardwhereR17=17O/16O This smartwatch is not