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  1. Tech

    Bridge Building

    For those fascinated by the art, science, and history of building bridges, this Web site provides a wealth of information and images devoted to structures designed to span obstacles of various sorts. Check out different bridge types, key components of bridges, explanations of forces that act on bridges, and much more. Go to: http://www.brantacan.co.uk/bridges.htm

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  2. Humans

    From the February 11, 1933, issue

    YELLOW SODIUM LIGHT EFFECTIVE OUTDOORS A commercial application has been found for the extremely efficient sodium-vapor lamp. A highway in Holland is now illuminated with these light units giving off an intense yellow glow; and this light, which makes color discrimination impossible and is devastating to Miladys makeup, is said to be especially desirable for […]

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  3. How the Butterfly Gets Its Spots

    The spots on a butterfly wing turn out to be unusually good model systems for a range of disciplines from genetics to behavioral ecology, offering biologists a chance to paint the really big picture of how evolution works.