welding

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Periodical Cicada, Adult, Magicicada spp. Requires 17 years to complete development. Nymph splits its skin, and transforms into an adult. Feeds on sap of tree roots. Northern Illinois Brood. This brood is the largest emergence of cicadas anywhere

Why Do Some Cicadas Appear Only Every 17 Years?

Internet http://www blue screen. Hompepage blog 2009, history and society, media news television, crowd opinion protest, In the News 2009, breaking news

Who Invented the Internet?

Drinking water is poured into a glass.

Water Fluoridation: Just the Facts

Cathedrale St.Jean in Lyon, France has a 14th-century astronomical clock that shows religious feast days till the year 2019; Perpetual Calendar

Ten Days That Vanished: The Switch to the Gregorian Calendar

Happy, smiling, flying pig

7 Everyday English Idioms and Where They Come From

Shadow of a man holding large knife in his hand inside of some dark, spooky buiding

7 of History's Most Notorious Serial Killers

Ethel Rosenberg arrested in August 1950. Photograph dated Aug. 8, 1950. American civilians executed for espionage. Spies, communists, Julius Rosenberg

Spies Like Us: 10 Famous Names in the Espionage Game

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Toyota assembly line

Worker welding a steel beam.

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alpha-particle welding spot welding resistance welding gas welding cold welding diffusion bonding electron-beam welding explosive welding forge welding friction welding brazing soldering

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