What makes the Mona Lisa — or any piece of art — successful? Sergio Velayosf/Flickr hide caption

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Good Art Is Popular Because It's Good. Right?

Research suggests that after a basic standard of quality is met, what becomes a success and what doesn't is essentially a matter of chance.

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The new test scans a mother's blood for bits of a fetus's DNA. iStockphoto hide caption

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Instructions for the colon screening test were devised so they can be understood in any language. Courtesy of Kaiser Permanente Center for Health Research hide caption

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Up till now, all babies have had two genetic parents. That could soon change. Klöpper & Eisenschmidt GbR/iStockphoto hide caption

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Blair Roberts, a 22-year-old sales associate at Colorado E-Smokes, "vapes" with an electronic cigarette in the Aurora, Colo., store. In the absence of federal rules, Colorado is among states that considered its own age requirements for the nicotine-delivery devices. Ed Andrieski/AP hide caption

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Filling out the forms is part of the ritual of going to the doctor. But with the Affordable Care Act, it's more complicated. iStockphoto hide caption

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