Walrus, shown here on a drying rack, represents a major source of nutritious food for many in Alaska's St. Lawrence Island. In recent years, warmer temperatures have pushed the sea ice further from St. Lawrence's shores, making walrus hunting more challenging. This shortfall has led to increased food insecurity on the island. Courtesy of Cara Durr hide caption

toggle caption Courtesy of Cara Durr

Former President Bill Clinton arrives on stage to deliver remarks on Tuesday, the second day of the Democratic National Convention, at the Wells Fargo Center in Philadelphia. Alex Wong/Getty Images hide caption

toggle caption Alex Wong/Getty Images

Vice President Joe Biden talks to students from Eagle Academy for Young Men during a walk at the Democratic National Convention on Tuesday. He will speak Wednesday night. Jessica Kourkounis/Getty Images hide caption

toggle caption Jessica Kourkounis/Getty Images

A Historic Night At The Democratic Convention

  • Download
  • <iframe src="https://www.npr.org/player/embed/487577867/487577868" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">

Julian Castro On Obama's Legacy, Latino Voter Turnout

  • Download
  • <iframe src="https://www.npr.org/player/embed/487577944/487577945" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">

While Democrats Get Behind Clinton, Trump Spotlights Their Discord

  • Download
  • <iframe src="https://www.npr.org/player/embed/487577916/487577917" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">

For Men Tortured By Chicago Police, Payments Only Go So Far In Repairing Lives

  • Download
  • <iframe src="https://www.npr.org/player/embed/487577902/487577903" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">

Obama Has Much Riding On Clinton's Candidacy

  • Download
  • <iframe src="https://www.npr.org/player/embed/487577895/487577896" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">

Between 1999 and 2014, the number of deaths in the U.S. from prescribed opioids quadrupled. Meanwhile medical students were getting very little training on how to spot patients who are at risk for addiction, or how to treat it. Matt Lincol/Getty Images/Cultura Exclusive hide caption

toggle caption Matt Lincol/Getty Images/Cultura Exclusive

Protesters with the Black Lives Matter movement and other groups march through downtown Philadelphia during the Democratic National Convention. Spencer Platt/Getty Images hide caption

toggle caption Spencer Platt/Getty Images