News

  1. Life

    For blood stem cells, the force is strong

    Blood flow boosts production of blood stem cells, two new studies show.

    By Tina Hesman Saey
  2. Space

    Cosmic dustup settles

    Two new studies document how crystalline dust forms in the hot, inner part of a young star’s planet-making disk and then gets incorporated into the cold, comet-forming region billions of kilometers away.

    By Ron Cowen
  3. Chemistry

    How RNA got started

    Scientists identify chemical reactions that could be responsible for the origin of life.

    By Solmaz Barazesh
  4. Chemistry

    Nonstick chemical pollutes water at notable levels

    Residues of nonstick chemicals — from unknown sources — appear to be approaching concentrations associated with adverse effects in laboratory animals.