Pharmacist Kristy Hennessee administers a vaccination against whooping cough at a Walgreen's pharmacy in Pasadena, Calif. last year. Robyn Beck/AFP/Getty Images hide caption

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Drug firms fear that being "liked" on Facebook could get them in trouble with the FDA. hide caption

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Howard Snitzer's heart stopped beating for 96 minutes last January. First responders didn't give up on him, thanks in part to capnography, a technology that let them know Snitzer still had a chance of coming back. May Clinic hide caption

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The scientists who sequenced the marijuana plant say they hope the next generation of pot will have stronger therapeutic compounds. JUAN MABROMATA/AFP/Getty Images hide caption

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A CT scan of a human lung. hide caption

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