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Nearly all teenagers get acne at some point, usually after puberty switches their oil glands into high gear. Ron Sumners/iStockphoto.com hide caption

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Two women check their cellphones as they hawk their wares on a bridge over the Artibonite River, whose waters are believed to be the source of Haiti's 2010 cholera outbreak. Nicholas Kamm/AFP/Getty Images hide caption

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Researchers have found that when bottles of sanitizer and wipes were kept around schools and students were cued to use them, they ended up missing significantly fewer days due to stomach bugs. /iStockphoto.com hide caption

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