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  1. Physics

    Big black holes can settle in the outskirts of small galaxies

    Astronomers have found dozens of surprisingly massive black holes far from the centers of their host dwarf galaxies.

    By Lisa Grossman
  2. Physics

    Spherical flames in space could solve the mystery of soot-free fires

    In microgravity, flames are sphere-shaped. Tests of fire on the International Space Station are helping show how gases flow within flames.

    By Emily Conover
  3. Chemistry

    Sweaty, vinegary and sweet odors mingle to make dark chocolate’s smell

    Scientists have worked out the chemistry of dark chocolate’s smell and reconstructed the aroma.

    By Carolyn Wilke
  4. Health & Medicine

    Faulty cellular antennae may cause a heart valve disorder

    Mitral valve prolapse might be caused by dysfunctional primary cilia meant to signal cells during development.