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  1. Physics

    Capping the length of extra dimensions

    The existence of a small, elderly black hole places a new upper limit on the length of any extra dimension, a new study suggests.

    By Ron Cowen
  2. Astronomy

    The Star That Ate a Mars

    COVER STORY: Scientists probe debris trapped by white dwarfs to learn more about what faraway Earthlike planets are made of.

    By Charles Petit
  3. Health & Medicine

    You Are Who You Are by Default

    A neural network active when the brain is at rest may prove critical to zoning out, a sense of self and envisioning the future.

    By Tina Hesman Saey
  4. Health & Medicine

    Bad Breath

    New studies detail how the invisible particles that pollute the air can damage heart, lungs and genetic programming.