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    What can radiometric dating reveal

    Our curriculum is based on five philosophical tenets (Fig. With respect to learning evolution, we wish to make it a hands-on experience with an overall theoretical framework of retrodictive inquiry.In geology and evolutionary biology, a prediction is a specification of what will happen whereas retrodiction is a specification of what did happen (Ben-Ari ).Radiometric dating techniques take advantage of the natural decay of radioisotopes.An isotope is one of two or more atoms which have the same number of protons in their nuclei, but a different number of neutrons.In this article, we describe an 8- to 10-day inquiry safari designed for middle/high school students to investigate hominid evolution using replica skulls of extant and extinct vertebrates.Students begin the unit using their own skulls and proceed to use the replica skulls of extant vertebrates to construct an understanding of how skulls can be used to interpret and infer diets, dentition, dental formulae, bipedal or quadrupedal locomotion, and the social structure of animals.Many radioactive substances decay from one nuclide into a final, stable decay product (or "daughter") through a series of steps known as a decay chain.

    Students gain an understanding of macroevolution (evolution occurring through deep time) vs microevolution, as radiometric dating of observed skulls reveals the magnitude of geologic time.A particular isotope of a particular element is called a nuclide. That is, at some random point in time, an atom of such a nuclide will be transformed into a different nuclide by the process known as radioactive decay.This transformation is accomplished by the emission of particles such as electrons (known as beta decay) or alpha particles.The numbers 238 and 206 represent these isotopes' atomic mass.The Uranium-238 radioisotope goes through 13 transitional stages before stabilizing into Lead-206 (U238 Pb206).

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