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If you have a fossil, you can tell how old it is by the carbon 14 dating method.
This is a formula which helps you to date a fossil by its carbon.
In another 1,600 years, half of that would decay, and so on until it was all gone.
Radiocarbon measurements have a range of uses, from analysing archaeological finds, to detecting fraudulent works of art, to identifying illegal ivory trading, to assessing the regeneration of brain cells in neurological patients.
The new study suggests that some of these current uses will be affected over this century, depending on how much fossil fuel emissions increase or decrease.
If you know how pure your block of radium originally was, it's relatively simple to calculate how old it is by measuring how much radium is left.
This is a very useful tool if you have solid blocks of radium that need dating, but if you don't know how much radium was there in the first place, the job is a lot harder.