Thousands of drones could be in commercial use in the U.S. within a few years. These unmanned aerial vehicles may assist everyone from farmers and firefighters to doctors and utility workers. But the government has not yet decided how to regulate this coming fleet of civilian drones. For more global science stories, visit: http://www.world-science.org/ NOVA is produced by WGBH in Boston. National corporate funding for NOVA is provided by The Boeing Company. Major funding for NOVA is provided by David H. Koch, the Corporation for Public Broadcasting, and PBS viewers.