Aspirin helps reduce the risk of cardiovascular disease, but the jury's still out on cancer. iStockphoto.com hide caption

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Cells gathered during a Pap test. Those on the left are normal, and those on the right are infected with human papillomavirus. Ed Uthman/Wikimedia Commons hide caption

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This would be considered a "once in a while" food. iStockphoto.com hide caption

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Coca-Cola says the caramel coloring in its signature soda has always been safe. OmerSukruGoksu/iStockphoto.com hide caption

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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. iStockphoto.com hide caption

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