Viagra could be used to treat Crohn's disease, researchers say

The anti-impotence drug Viagra could potentially help treat Crohn's disease, British researchers propose. FULL STORY

NASA's Mars orbiter approaches planet

NASA engineers are preparing for the Mars Reconnaissance Orbiter to make its risky approach to the planet on March 10. FULL STORY

INDEPTH: Mars

Gene study links virus to prostate cancer

A new virus has been found in men with prostate cancer, but scientists don't yet know if it causes the disease. FULL STORY

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