S41E20: January 28, 2016

Thursday on the NewsHour, the World Health Organization considers issuing an emergency over the fast-spreading Zika virus. Also: An American freed from Iranian prison describes his ordeal, a Republican debate without Trump, how ethanol may fuel Iowa voters, why the U.S. economy’s best days may be over, remembering the Challenger disaster, why radio will never die and two girls who love to build.