News

  1. Planetary Science

    Dust delays Martian rover

    A dust storm has delayed the descent of the Mars rover Opportunity into Victoria crater.

    By Ron Cowen
  2. Health & Medicine

    Mouse method turns skin cells to stem cells

    Reprogrammed mouse skin cells that act as stem cells may offer an alternative for research involving embryos.

    By Carolyn Barry
  3. Health & Medicine

    Spermicide Flip Side: Compound may promote papillomavirus infection

    The widely used spermicide nonoxynol-9 may boost the infectiousness of human papillomavirus, mouse tests show.

    By Nathan Seppa
  4. Physics

    Dropping the Ball: Air pressure helps objects sink into sand

    A ball plunges deeper into sand under atmospheric pressure than under a vacuum, because the presence of air allows sand to flow like a liquid.