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When an archeologist has identified the source of the obsidian from which an artifact is made, he or she may be able to date the artifact using the obsidian hydration technique.This technique of dating obsidian artifacts measures the microscopic amount of water absorbed on freshly broken surfaces.Chronometric techniques include radiometric dating and radio-carbon dating, which both determine the age of materials through the decay of their radioactive elements; dendrochronology, which dates events and environmental conditions by studying tree growth rings; fluorine testing, which dates bones by calculating their fluorine content; pollen analysis, which identifies the number and type of pollen in a sample to place it in the correct historical period; and thermoluminescence, which dates ceramic materials by measuring their stored energy.Scientists first developed absolute dating techniques at the end of the 19th century.

Chronometric dating has advanced since the 1970s, allowing far more accurate dating of specimens.

But how did this concept develop, and is there any evidence to support it?

Ancient alien theory grew out of the centuries-old idea that life exists on other planets, and that humans and extraterrestrials have crossed paths before.

Adrian Grahams began writing professionally in 1989 after training as a newspaper reporter.

His work has been published online and in various newspapers, including "The Cornish Times" and "The Sunday Independent." Grahams specializes in technology and communications.

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