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  1. Cosmology

    Gamma rays offer mixed messages on identity of dark matter

    Conflicting results from Fermi telescope puzzle astronomers about dark matter’s true identity.

    By Andrew Grant
  2. Chemistry

    Atom breaks limit of lost electrons

    An iridium atom sets the record for highest oxidation state at +9.

    By Beth Mole
  3. Life

    Gut microbes less diverse in humans than in apes

    An analysis of gut bacteria shows that humans have evolved to possess less diversity in microbe populations.

    By Tina Hesman Saey
  4. Life

    Hummingbirds take stab at rivals with dagger-tipped bills

    Sharp points on the bills of male long-billed hermit hummingbirds may have evolved as weaponry.