Notebook

  1. Astronomy

    Closest star approach to the sun

    Astronomers discover a binary system that made the closest known flyby of the sun.

    By Christopher Crockett
  2. Life

    Insulin-suppressing hormone discovered

    A newly discovered hormone suppresses insulin production and secretion in fruit flies and maybe in humans.

    By Tina Hesman Saey
  3. Science & Society

    U.S. research workforce lags by some measures

    Scientists’ share of total employment is lower in United States than in 16 other countries.

    By Lila Guterman
  4. Physics

    Raindrops kick up soil chemicals

    The champagne-like fizz produced when a raindrop hits the ground may be responsible for the earthy aroma after a rainstorm.