PRI's The World: 01/21/2016

Today we learn how the Zika virus spreads and why Brazil has been especially hit hard by the virus. We also hear from two Syrians who've ended up in unlikely places around the globe. One refugee is seeking asylum in South Korea. The other is a student in Mexico. Plus, our solar system might be a bit bigger than we thought. Astronomers say that they've found what could be a ninth planet — way bigger than poor Pluto — but here's the thing: No one's actually seen it.