Chickens talk about geographical discoveries. Free Technical Library News

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Chickens talk about geographical discoveries

04.12.2007

The Polynesians discovered America long before Columbus. This is the result of a study of half-decomposed chicken bones found in the remains of a human settlement on the southern coast of Chile.

Carbon dating has shown the bones to be from 1321 to 1407, at least 85 years before Columbus's discovery. DNA analysis from the bones showed that the chickens were not European breeds, but Polynesian.

Birds from the Easter Islands, Tonga and Samoa are closest to the Chilean chickens, so far it was believed that chickens were first brought to America by Spanish settlers around 1500.

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Magnetic heads polished with green tea 19.07.2004

Engineers from Arizona have figured out how to make a cheap and, most importantly, biodegradable liquid for polishing magnetic heads based on green tea.

The reading heads of magnetic disks must be polished very carefully: if bumps occur on the surface, their height should not exceed ten angstroms. To wash off all kinds of dust particles, as well as particles of polishing powder, a liquid with sticky additives is used.

As you might guess, usually these substances are specially synthesized, and, being too tough for soil microbes, they pollute the environment after use. The volume of such waste is not small - more than 160 million hard drives are produced per year. Therefore, there is a desire to replace synthesized substances with natural ones: they were originally intended for food by microorganisms.

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Guessing that the sticky substance should be looked for in tea was not easy. A case helped here: one day the head of the work noticed that the structure of the components of the glue with which sea acorns are glued to the bottom of ships is similar to tea tannins. Well, it was a matter of technology to isolate the appropriate substance from the plant.

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