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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.However, rocks and other objects in nature do not give off such obvious clues about how long they have been around.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.

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He was awarded the Nobel Prize in Chemistry for his discovery of isotopes in 1921.

First Woman To Graduate BSc Born 24 July 1874, Glasgow, Scotland. Ruth Pirret (1874-1939) was the first woman to graduate BSc from the University, in 1898.

It led to aging techniques developed for plants, documents, societies, and ancient buildings.

Boltwood gave back to geology a sense of time that the misestimates of previous researchers had taken away.