Oklahoma Gov. Mary Fallin issues a statement to the media after the execution of Clayton Lockett. Oklahoma Secretary of Safety and Security Michael C. Thompson stands behind her at the Oklahoma State Capitol in Oklahoma City. Alonzo Adams/AP hide caption

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Loved ones express their grief at the burial of Ramon Romero Ramirez in Chichigalpa, Nicaragua, January 2013. The 36-year-old died of chronic kidney disease after working in the sugar cane fields for 12 years. Ramirez is part of a steady procession of deaths among cane workers. Ed Kashi/VII hide caption

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Testosterone levels in men can go up and down throughout the day. Katherine Streeter for NPR hide caption

itoggle caption Katherine Streeter for NPR

Bridgeit Vaughn (left), of the billing office at Mid State Orthopaedic, meets with Gayle Jackson-Pryce to discuss the costs of Jackson-Pryce's upcoming shoulder surgery. Jenny Gold for NPR hide caption

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Fearful of catching the MERS virus, workers wear masks during a soccer match on April 22 at King Fahad stadium in Riyadh. Fayez Nureldine/AFP/Getty Images hide caption

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An Egyptian Muslim prays during a ritual in Mina, Saudi Arabia, October 2013. Some people wore masks during the hajj pilgrimage last year to protect against the Middle East Respiratory Syndrome. Amr Nabil/AP hide caption

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The dream of epilepsy research, says neurobiologist Ivan Soltesz, is to stop seizures by manipulating only some brain cells, not all. Steve Zylius/UC Irvine Communications hide caption

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A child receives a polio vaccine Sunday in Kano, Nigeria. The country is the primary source of the virus in Africa but appears to be making progress against the disease; the current outbreak in Cameroon that has spread to Equatorial Guinea came by way of Chad, not Nigeria. Sunday Alamba/AP hide caption

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Xanax and Valium, prescribed to treat anxiety, mood disorders and insomnia, can be deadly when mixed with other sedatives. Dean812/Flickr hide caption

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