+"Half-life" is the time required for a quantity to reduce to half its initial value. It most commonly describes the rate at which unstable [Atomic Nuclei](/wiki/atomic_nuclei) undergo [Radioactive Decay](/wiki/radioactive_decay). This inherent constant helps characterize the stability and lifespan of substances.
+## See also
+- [Isotopes](/wiki/isotopes)
+- [Nuclear Physics](/wiki/nuclear_physics)
+- [Carbon Dating](/wiki/carbon_dating)
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