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To figure out how we pick mates, scientists have measured every shape and angle of the human face, studied the symmetry of dancers, crafted formulas from the measurements of Playboy models, and had both men and women rank attractiveness based on smelling armpit sweat.

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Radiometric dating is sometimes referred to as radioactive dating.

In fact, you might like this term better, because the dating method relies on the known decay rate of radioactive isotopes.

Radiometric dating, or radioactive dating as it is sometimes called, is a method used to date rocks and other objects based on the known decay rate of radioactive isotopes.

Different methods of radiometric dating can be used to estimate the age of a variety of natural and even man-made materials.

Some of the information was updated 2/00 — many bad links have either been updated or removed and some e-mail addresses have been changed.

Keep in mind that several people may have moved and are no longer at the locations indicated. Allmon received his doctorate in Earth and Planetary Sciences from Harvard University.

Plus, get practice tests, quizzes, and personalized coaching to help you succeed. So we have to rely on something called radiometric dating to figure out the age of rock.

However, none of the criticisms of young earth creationists have any scientific merit.

Radiometric dating remains a reliable scientific method.

For articles on the RATE project, see the Rate Index.

Learn about three common types of radioactive decay: alpha decay, beta decay and gamma decay. You simply subtract your birth date from the current date. It was also discovered that these elements decayed into other elements at fixed rates.

Because these rates do not change and because the radiation that rocks give off can be measured, it became possible to calculate the time the rock was formed or, in other words, the rock's birth date - give or take a few thousand years or so.