Kids might be more satisfied if they get one good treat instead of one good treat and one lesser treat. iStockphoto.com hide caption

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The Ask.fm website has been linked to two bullying cases that led to suicides. Danny E. Martindale/Getty Images hide caption

itoggle caption Danny E. Martindale/Getty Images

Among families with children age 8 and under, ownership of tablet devices has jumped fivefold since 2011, reports the nonprofit Common Sense Media. Jeremy Hiebert/Flickr hide caption

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Illustration by Daniel Horowitz for NPR

Ava Gene's, a Roman-inspired restaurant in Portland, Ore., incorporates colatura, a modern descendant of ancient Roman fish sauce, into several of its dishes. Deena Prichep/NPR hide caption

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This riboflavin-rich material can be used to print intricate, microscopic structures in three dimensions. Courtesy of North Carolina State University hide caption

itoggle caption Courtesy of North Carolina State University

Anoushka Shankar's new album, Traces of You, comes out Tuesday. Harper Smith/Courtesy of the artist hide caption

itoggle caption Harper Smith/Courtesy of the artist

Clostridium difficile, a bacterium that causes severe diarrhea, can be difficult to treat with antibiotics. Stefan Hyman/University of Leicester hide caption

itoggle caption Stefan Hyman/University of Leicester