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  1. Chemistry

    Chemistry au Naturel

    Chemists aim to mimic natural systems with the hope of developing more-efficient chemical processes that are also less harmful to the environment.

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  2. Math

    Knot Divided in Snow

    The Möbius strip gets embedded in a knotty block of snow.

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  3. Humans

    From the February 2, 1935, issue

    Crystal stalagmites from winter rain, evidence for early inhabitants in Texas, and a new transmission system for electric power.

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  4. Tech

    Nanotech Facts

    The National Nanotechnology Initiative has a Web site devoted to “Nanotech Facts.” It provides an introduction to nanotechnology and a brief description of its many applications and potential societal implications.