PRI's The World: 01/28/2016

First today, more dire warnings about the Zika virus. Health experts estimate that the next year might see three to four million cases of Zika in the Americas alone. The potential explosion in numbers has global health officials on alert. But what's the danger, really? Plus, a look back on the Challenger disaster, which happened 30 years ago today, from someone who witnessed the event from the former Soviet Union. And, we hear the story behind a rare Frida Kahlo painting on exhibit right here in Boston.