Puerto Rico; DeMane Davis

Host Meghna Chakrabarti talks about what's happening in Puerto Rico with a reporter just returning from the island. We also talk about the guns used in the Las Vegas shooting and possible modifications. Plus: An MIT professor is among those awarded the Nobel Prize in Physics. And filmmaker DeMane Davis who is directing two episodes of "Queen Sugar," a TV series by Ava DuVerny that airs on Oprah's OWN.