Radioactivity is a part of nature. As a result of radioactivity, all the matter

Radioactivity is a part of nature. As a result of radioactivity, all the matter has a half-life – this means the time it takes for a substance of material to decay to half of its weight.
Explain how this concept may be used in the scientific community, and can you think of any application where this might be useful to scientists?

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