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    It is in knowing what made past cultures cease to exist that could provide the key in making sure that history does not repeat itself.Over the years, archaeology has uncovered information about past cultures that would have been left unknown had it not been with the help of such technologies as radiocarbon dating, dendrochronology, archaeomagnetic dating, fluoride dating, luminescence dating, and obsidian hydration analysis, among others.This means that if you have a sample of carbon-14 with 1,000 atoms, 500 of these atoms are expected to decay over the course of 5730 years.Some of the atoms may decay right away, while others will not decay for many thousands more years.The curie was named after Marie and Pierre Curie who discovered the element radium. The half-life of an isotope is the time on average that it takes for half of the atoms in a sample to decay.For example, the half-life of carbon-14 is 5730 years.

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    A man called Willard F Libby pioneered it at the University of Chicago in the 50's. This is now the most widely used method of age estimation in the field of archaeology.Fossils are the remains of animals or plants that lived a long time ago.When we think of fossils, the first things that come to mind are the bones of dinosaurs; but a fossil can be anything.Types of Fossils There are two main types of fossils: body fossils and trace fossils.A body fossil is the physical remains of an animal. Some very small organisms, called microbacteria, leave behind microscopic particles called filaments.

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