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  1. Physics

    Out of Sight

    Shields that confer invisibility on objects and people may be on the horizon.

    By Peter Weiss
  2. Tech

    Smells Like the Real Thing

    Chemical sensors that take cues from the mammalian pattern-based approach to identifying odors and flavors create colorful readouts that even the eyes can distinguish.

    By Aimee Cunningham
  3. Earth

    Visiting RadTown

    The U.S. Environmental Protection Agency has launched an interactive Web site that uses an animated town to provide basic information on radiation in the environment—from lasers in a stadium light show to x rays at the dentist’s office. This virtual community shows the wide variety of radiation sources commonly encountered in everyday life.