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  1. Health & Medicine

    MicroRNAs provide telltale signature of organ rejection

    Levels of microRNAs in the blood and tissue distinguish rejected transplants from healthy tissue.

    By Tina Hesman Saey
  2. Physics

    Elusive Higgs particle has fewer hideouts

    Physicists have announced new limits on the mass of the elusive Higgs boson. The particle's discovery would complete the standard model of particle physics.

    By Ron Cowen
  3. Health & Medicine

    Gradual treatment of peanut allergies shows promise

    A slow and incremental introduction of peanuts into the diet helps some children overcome an allergy to the food, but it takes time and close supervision.

    By Nathan Seppa
  4. Earth

    Pushing back an oxygen-rich atmosphere

    Hematite crystals in Australian rocks hint that Earth’s atmosphere was oxygenated earlier than previously thought.