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| Nuclear Physics and Radioactivity |

This is Sue, the largest and most complete Tyrannosaurus rex ever found. It was discovered by Susan Hendrickson in 1990 and is currently on display at The Field Museum in Chicago. Paleontologists use the disintegration of radioactive nuclei to date the fossil remains of extinct species, a method that this chapter discusses. (Reuters NewMedia, Inc/ Corbis Images)

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