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(You can read up on radioactivity and isotopes here).

Carbon-14, the radioactive version of carbon, is rare — it only makes up one trillionth of all the carbon in the world.

So the proportion of carbon-14 inside living things is the same as the proportion of carbon-14 in the atmosphere at that time.

But when we stop eating, or when plants stop photosynthesising, our carbon-14 levels no longer get topped up.

And that something else starts where Earth meets space.

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