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As the Earth's upper atmosphere is bombarded by cosmic radiation, atmospheric nitrogen is broken down into an unstable isotope of carbon - carbon 14 (C-14).The unstable isotope is brought to Earth by atmospheric activity, such as storms, and becomes fixed in the biosphere.

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Animals eating those plants in turn absorb Carbon-14 as well as the stable isotopes.

It's development revolutionized archaeology by providing a means of dating deposits independent of artifacts and local stratigraphic sequences.

Libby in 1949, and has become an indispensable part of the archaeologist's tool kit since.

Scientists soon used the technique on materials ranging from the dung of a giant sloth from a Nevada cave; seaweed and algae from Monte Verde, Chile, the oldest archaeological site in the Western Hemisphere; the Shroud of Turin; and the meteorite that created the Henbury Craters in northern Australia.

Among the artifacts from the University of Chicago’s Oriental Institute that Willard Libby tested during the radiocarbon dating development process was this wood from an ancient Egyptian coffin.