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  1. Genetics

    Ancient DNA suggests people settled South America in at least 3 waves

    Genetic studies of ancient remains are filling in the picture of who the earliest Americans were and how they spread through the Americas long ago.

    By Tina Hesman Saey
  2. Planetary Science

    Hints of Oort clouds around other stars may lurk in the universe’s first light

    Sifting through the universe’s early light could reveal planetary graveyards orbiting other stars.

    By Lisa Grossman
  3. Chemistry

    These fragile, futuristic batteries run longer with a little oil

    A redesign for batteries that use aluminum and oxygen could help these inexpensive, lightweight power cells last longer.

    By Maria Temming
  4. Life

    How a life-threatening allergic reaction can happen so fast

    Cells that act as sentries facilitate quick communication between allergens and anaphylaxis-triggering immune cells, a study in mice finds.