Multiple sclerosis pill Tecfidera is on the top 10 list of most costly specialty drugs, as measured by overall spending, for California's health benefit system for public workers and retirees. John/Flickr hide caption

toggle caption John/Flickr

Nancy Retzlaff, chief commercial officer for Turing Pharmaceuticals, was asked how much the drug Daraprim costs at the House Oversight and Government Reform Committee on Capitol Hill on Thursday. Brendan Smialowski/AFP/Getty Images hide caption

toggle caption Brendan Smialowski/AFP/Getty Images

The Noor I Concentrated Solar Power plant, shown on Thursday, is the first phase of a large solar thermal power plant that is intended to supply more than a million Moroccans with electricity. Fadel Senna/AFP/Getty Images hide caption

toggle caption Fadel Senna/AFP/Getty Images

Actress and model Dree Hemingway, daughter of Mariel Hemingway, is the first Playboy Playmate to be featured without full-frontal nudity. She's seen here in a cropped version of her centerfold photograph. Angelo Pennetta/Playboy hide caption

toggle caption Angelo Pennetta/Playboy

Martin Shkreli, former CEO of Turing Pharmaceuticals, smiles beside Nancy Retzlaff, Turing's chief commercial officer, during a House Oversight and Government Reform Committee hearing on Capitol Hill on Thursday. Mark Wilson/Getty Images hide caption

toggle caption Mark Wilson/Getty Images

NPR thanks our sponsors

Become an NPR sponsor