Many hospitals are perilously close to running out of a form of methotrexate that's necessary to inject in high doses to treat certain forms of cancer. hide caption

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The latest study to look at cellphone safety found no increased risk of brain cancer.

Justin Sullivan/Getty Images hide caption

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Hair stylists already spend a lot of time staring at the back of people's heads. Researchers thought: Why not train them to check for suspicious lesions and other signs of skin cancer while they're at it?

Seth Wenig/AP hide caption

itoggle caption Seth Wenig/AP