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  1. Health & Medicine

    Colonoscopy screening would avert cancer

    Increased use of colonoscopy could significantly reduce the number of colon cancer deaths and wouldn't cost much more overall than other tests.

    By Nathan Seppa
  2. Tech

    Pile-o’-polymers breaks up on command

    Stacks of polymers designed to break apart in acid solution or at a certain voltage may prove useful for releasing drugs, pesticides, or other compounds where and when needed.

    By Peter Weiss
  3. Tech

    Pores of glass skin shrink from light

    Ultraviolet light can fine-tune the properties of intricately structured, porous films of glass that, among other uses, may make possible the long-sought direct extraction of oxygen and nitrogen gases from air.