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  1. Health & Medicine

    D-fending the Colon: Bile component triggers vitamin D receptor

    The protein that enables cells to respond to vitamin D also helps the gastrointestinal tract protect itself from an especially dangerous acid in bile.

    By John Travis
  2. Tech

    Live Tour: Joystick journeys reveal tumor interiors

    A new holographic technique may someday enable doctors to skip certain biopsies and choose instead to take video excursions inside suspicious growths in skin or internal body linings.

    By Peter Weiss
  3. Health & Medicine

    Wholesome Grains: Insulin effects may explain healthful diet

    Overweight people who eat whole grains rather than refined ones appear better equipped to manage their blood-sugar concentrations with minimal production of the hormone insulin, which could help explain why a diet rich in whole grains appears to guard against type II diabetes and heart disease.