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  1. Tech

    Ghost Town Busters

    Facing the threat of a radioactive mess from a dirty bomb, government and industry labs are creating novel cleaning agents and fixatives to aid rescue operations and speed restoration of contaminated zones.

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  2. Chemistry

    Making a Little Progress

    Scientists are using nanotechnology to develop new strategies for diagnosing and treating cancer.

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  3. Math

    Sliding Around

    Seemingly simple sliding-coin puzzles can be surpassingly tough.

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  4. Humans

    From the October 19, 1935, issue

    Boulder Dam lake and a new test for lead poisoning.

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  5. Humans

    Misleading Numbers

    The “Number Watch” Web site focuses on “misleading” numbers that appear in the media and are often used to promote specific causes, as compiled by retired engineering professor John Brignell of the University of Southampton.