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Carbon dating is a technique used to determine the approximate age of once-living materials. It is based on the decay rate of the radioactive carbon isotope 14 C, a form of carbon taken in by all living organisms while they are alive. Before the twentieth century, determining the age of ancient fossils or artifacts was considered the job of paleontologists or paleontologists, not nuclear physicists. By comparing the placement of objects with the age of the rock and silt layers in which they were found, scientists could usually make a general estimate of their age. However, many objects were found in caves, frozen in ice , or in other areas whose ages were not known; in these cases, it was clear that a method for dating the actual object was necessary. In , the American chemist Bertram Boltwood - proposed that rocks containing radioactive uranium could be dated by measuring the amount of lead in the sample. This was because uranium, as it underwent radioactive decay , would transmute into lead over a long span of time.

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Amy at first decides to have an abortion, but backs out at the last minute and decides to keep the baby. They soon fall in love, and the two stay together throughout the season, even after Ben reveals to Amy he knows' that she is pregnant with Ricky's baby What Have You Done to Me? Ben decides to get engaged to Amy after finding out about the pregnancy, thinking it will help her situation. The two get illegally married not knowing that "it didn't count" The Secret Wedding of the American Teenager , though the marriage is deemed invalid by both Amy's and Ben's parents because of their ages and the fact that they used fake I. Amy then decides to attend a school specifically targeted towards aiding teenage mothers but is talked out of it by her father.

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Jennifer Leann Carpenter born December 7, is an American actress. Raphael the Archangel and then Sacred Heart Academy. Carpenter first attracted critical attention for her performance in The Exorcism of Emily Rose. She was also named 'Breakout Performer' at the Scream Awards. In , she also starred in Quarantine , an American remake of the Spanish horror film [REC] , about a deadly zombie virus outbreak in an apartment complex. Carpenter played the role of Debra Morgan in the Showtime crime drama television series Dexter , which premiered October 1,

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