"Build Bridges Not Walls," reads a banner held by demonstrators on London's Tower Bridge to protest Donald Trump's inauguration as U.S. president on Friday. Matt Dunham/AP hide caption

toggle caption
Matt Dunham/AP

Journalists work in the Trump campaign's designated media pen as they wait for the candidate to arrive at a town hall meeting on March 14 in Tampa, Fla. Foreign journalists covering the campaign say gaining official access to Trump events has been more challenging than to Hillary Clinton's. Brian Blanco/Getty Images hide caption

toggle caption
Brian Blanco/Getty Images

Patrick Meier (center, in cap) flies a drone in Nepal after the earthquake in 2015. Meier and his team were able to to capture detailed images of damage around the capital, Kathmandu. He believes using this technology will make crisis mapping even more effective for disaster response. Courtesy of Patrick Meier/WeRobotics hide caption

toggle caption
Courtesy of Patrick Meier/WeRobotics

When Disaster Strikes, He Creates A 'Crisis Map' That Helps Save Lives

  • Download
  • <iframe src="https://www.npr.org/player/embed/495795717/495965272" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">

Crisis Mapping Pioneer Focuses On Humanitarian Uses For Drones

  • Download
  • <iframe src="https://www.npr.org/player/embed/495992706/495993613" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

Members of the Taliban militia ride in vehicles during Afghanistan's annual Independence Day parade in Kabul on Aug. 19, 2001. Afghanistan was largely cut off from the world during the Taliban's rule from 1996 to 2001. That changed dramatically after the Sept. 11 attacks. Saeed Khan/AFP/Getty Images hide caption

toggle caption
Saeed Khan/AFP/Getty Images

Hillary Clinton gives a speech Thursday, the final day of the Democratic National Convention, and Donald Trump speaks on July 21, the last day of the Republican National Convention. Saul Loeb/AFP/Getty Images; Jim Watson/Getty Images hide caption

toggle caption
Saul Loeb/AFP/Getty Images; Jim Watson/Getty Images

People gather and lay flowers on Nice's Promenade des Anglais on July 15. A French-Tunisian attacker left 84 people dead after driving a truck through crowds gathered to watch fireworks during Bastille Day celebrations. The attacker then opened fire on the crowd before being shot dead by police. Carl Court/Getty Images hide caption

toggle caption
Carl Court/Getty Images

Pakistan's most renowned humanitarian, Abdul Sattar Edhi (left), shares a meal with children living in one of his charity houses in Karachi. Edhi died Friday at age 88. Shakil Adil/ASSOCIATED PRESS hide caption

toggle caption
Shakil Adil/ASSOCIATED PRESS

Prime Minister David Cameron's cat, Larry, sits on the steps of No. 10 Downing St. in London on June 24, the day Brexit voting results were announced. If the Cameron family wants to take Larry along on holiday to France, a Brexit could complicate plans. It's possible that traveling to and from the EU with pets will grow more cumbersome. Alastair Grant/AP hide caption

toggle caption
Alastair Grant/AP

European Council President Donald Tusk (center) arrives for a meeting at EU headquarters in Brussels on Friday. Top European Union officials were hunkering down to ascertain next steps after British voters decided to leave the 28-nation bloc. Virginia Mayo/AP hide caption

toggle caption
Virginia Mayo/AP