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  1. Physics

    Electric Foam: Scientists uncover basis of material oddball

    Specially treated polypropylene foam can mimic the defining behavior and other desirable properties of ceramic piezoelectric materials, which generate electric signals when squeezed.

    By Peter Weiss
  2. Tech

    Shining True: Marking original documents with a lick of gloss

    Scientists have a new way of making forgery-proof documents by using laser color printers to embed hologramlike images in a document’s glossy surface.

    By Sorcha McDonagh
  3. Ecosystems

    Shark Serengeti: Ocean predators have diversity hot spots

    The first search for oceanic spots of exceptional diversity in predators has turned up marine versions of the teeming Serengeti plains.

    By Susan Milius
  4. Anthropology

    New World Newcomers: Men’s DNA supports recent settlement of the Americas

    New data on genetic differences among the Y chromosomes of Asian and Native American men support the notion that people first reached the Americas less than 20,000 years ago.