Chronometric Dating in Archaeology pp Cite as. A freshly-made surface of obsidian volcanic glass of rhyolitic composition will absorb water which slowly penetrates by diffusion into the body of the artifact. Although the depth of penetration can be measured by various methods, it is generally determined by microscopic examination on thin sections of the artifact cut normal to the surface.

The rate of penetration of water is dependent upon several factors, primarily the chemical composition of the glass and the temperature at which the hydration occurred. Discussions are given of techniques for measuring the hydration thickness, measurement or estimates of ambient hydration temperature, chemical composition of the obsidian, and the conversion of hydration thickness to dating the time of manufacture of the artifact.

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Google CEO Sergey Brin announced last week that he regrets how much Smartphones stop us really taking note of our fellow man. According to him, this will all be different with Google Glass. Far from it, it is more likely to get worse. As you can see in this video, a short attention span in combination with augmented reality and voice control ruins every date more thoroughly than a smartphone ever could.

We wonder if the makers of this video were chosen as Glass Explorers exclusive testers of the glasses. Maybe Google is showing a sense of humor, after all, this is one of the better contributions under the keyword ifihadglass handed in to Google in the past weeks. Save my name, email, and website in this browser for the next time I comment.