Engineering the perfect cookie: You can control the diameter and thickness of your favorite chocolate chip cookies by changing the temperature of the butter and the amount of flour in the dough. Morgan Walker/NPR hide caption

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Davar Ardalan/NPR
A Day In The Life: Blacks At The Cutting Edge Of Innovation
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A young girl stands in the doorway of a home in Uttar Pradesh, India. The markings on the door show that a polio immunization team vaccinated children in the home. Alyce Henson/Courtesy of Rotary International hide caption

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Click to see an interactive map of Meriden, N.H., with stories from Okkervil River's Will Sheff about his childhood there. William Schaff hide caption

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Okkervil River: Coming Of Age In Small Town America
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Click to see an interactive map of Meriden, N.H., with stories from Okkervil River's Will Sheff about his childhood there. William Schaff hide caption

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Listen to 'Down Down The Deep River' by Okkervil River
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Bobbie Hanvey and his son Steafán Hanvey, in Northern Ireland. Courtesy of Peter Muhly hide caption

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Like Father, Like Son: Creating Art In A Time Of Troubles
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Sonny Vaahn, 25, holds his family's refugee identification in Bronx, N.Y. The card was issued to them during their initial entry into a refugee camp along the Thai-Cambodian border after the "killing fields" atrocities ended in Cambodia. Courtesy of Pete Pin hide caption

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Ricardo Galvez, Giovanna Meneses Pisco and Arely Betzabe pose for a photograph in front of their former home El Ayllu. The family was back in the neighborhood to gather some of their belongings, and Giovanna spent the hours teary-eyed. As soon as families moved out, the Ministry of Transportation and Communications, with the help of paid community members, began to demolish the buildings. Courtesy of Elie Gardner hide caption

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