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  1. Planetary Science

    Odyssey’s Homer: Hints of water near both poles of Mars

    Sensors on board the Mars Odyssey spacecraft have spied strong signs of ice buried near both poles of the Red Planet, exactly the regions where scientists previously had said that such frozen water deposits could exist.

    By Sid Perkins
  2. Health & Medicine

    Dieting woes tied to hunger hormone

    A rise in the appetite-enhancing hormone ghrelin after weight loss may explain why dieters regain pounds.

    By John Travis
  3. Health & Medicine

    Arthritis drug fights Crohn’s disease

    The inflammation-fighting drug infliximab can hold off the painful symptoms of Crohn's disease for as long as a year in many patients.