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This means that although they are very similar chemically, they have different masses.
The total mass of the isotope is indicated by the numerical superscript.
A huge amount of work is currently underway to extend and improve the calibration curve.
In 2008 we could only calibrate radiocarbon dates until 26,000 years.
The whole lifecasting thing freaks a lot of people out since they aren't in control of the content.
The uncalibrated date is given with the unit BP (radiocarbon years before 1950).