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The results showed that Ötzi died over 5000 years ago, sometime between 33 BC.

Uranium has a very long half-life and so by measuring how much uranium is left in a rock its approximate age can be worked out.

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Well, a simple explanation is that it is the time required for a quantity to fall to half of its starting value.

Learn about half-life and how it is used in different dating methods, such as uranium-lead dating and radiocarbon dating, in this video lesson.

For example, in 1991, two hikers discovered a mummified man, preserved for centuries in the ice on an alpine mountain.