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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. As we age, our hair turns gray, our skin wrinkles and our gait slows.

In a related article on geologic ages (Ages), we presented a chart with the various geologic eras and their ages.

The thing that makes this decay process so valuable for determining the age of an object is that each radioactive isotope decays at its own fixed rate, which is expressed in terms of its half-life.

Although the time at which any individual atom will decay cannot be forecast, the time in which any given percentage of a sample will decay can be calculated to varying degrees of accuracy.

Various elements are used for dating different time periods; ones with relatively short half-lives like carbon-14 (or C) are useful for dating once-living objects (since they include atmospheric carbon from when they were alive) from about ten to fifty thousand years old. Longer-lived isotopes provide dating information for much older times.

The key is to measure an isotope that has had time to decay a measurable amount, but not so much as to only leave a trace remaining.

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the "dungarees" (jeans) — with one of each group playing off a member of the other. Carlson and Andy were the all-but-powerless management (Andy not being able to get anyone to play the playlist, for instance); Herb and Venus were the flashily-dressed Casanovas; Les and Johnny were the nutcases (Johnny with his "phone police", Les with his masking-tape walls), and Jennifer and Bailey were the women. "dungarees" idea was used in a few early episodes (notably the turkey episode and "The Contest Nobody Could Win", where it's brought up by the characters), but quickly faded away in favour of a straight ensemble show.

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