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  1. Cells’ Root: Adult stem cells have a master gene

    Scientists have found a master gene that allows tissue-regenerating stem cells to retain their regenerative capacity.

    By Patrick Barry
  2. Astronomy

    Stellar Spectacular: Brightest supernova

    Astronomers have discovered the brightest stellar explosion ever observed, and it could be the first example of a rare type of supernova involving a freakishly massive star.

    By Ron Cowen
  3. Physics

    Degrees of Quantumness: Shades of gray in particle-wave duality

    Light can be made to act as if it's composed of particles, waves, or something in between.

    By Davide Castelvecchi

  4. 19830

    Perhaps there need not be “degrees of quantumness”. As the beams pass increasingly closer to the surface, the plate will induce a small (but increasingly larger) spread of energies (hence wavelengths) in the electrons within the beam, possibly explaining the “smearing out” of the fringes in the interference pattern.