![170904) -- LAUSANNE, Sept. 4, 2017 -- A competitor of drones race adjusts his drone during the Drone Days 2017 in Lausanne, Switzerland, Sept. 3, 2017. The three days Drone Days 2017 170904) -- LAUSANNE, Sept. 4, 2017 -- A competitor of drones race adjusts his drone during the Drone Days 2017 in Lausanne, Switzerland, Sept. 3, 2017. The three days Drone Days 2017](https://c8.alamy.com/comp/2RNPNF8/170904-lausanne-sept-4-2017-a-competitor-of-drones-race-adjusts-his-drone-during-the-drone-days-2017-in-lausanne-switzerland-sept-3-2017-the-three-days-drone-days-2017-including-drones-race-robotics-showcase-and-flying-trials-concluded-on-sunday-which-drew-more-than-5000-visitors-to-attend-jmmn-switzerland-lausanne-drone-days-2017-xuxjinquan-publicationxnotxinxchn-lausanne-sept-4-2017-a-competitor-of-drones-race-adjust-his-drone-during-the-drone-days-2017-in-lausanne-switzerland-sept-3-2017-the-three-days-drone-days-2017-including-drones-race-robotics-showcase-and-fly-2RNPNF8.jpg)
170904) -- LAUSANNE, Sept. 4, 2017 -- A competitor of drones race adjusts his drone during the Drone Days 2017 in Lausanne, Switzerland, Sept. 3, 2017. The three days Drone Days 2017
![Engineers design drones that can stay aloft for five days | MIT News | Massachusetts Institute of Technology Engineers design drones that can stay aloft for five days | MIT News | Massachusetts Institute of Technology](https://news.mit.edu/sites/default/files/download/201706/MIT-5-day-UAV-4-press.jpg)
Engineers design drones that can stay aloft for five days | MIT News | Massachusetts Institute of Technology
![170904) -- LAUSANNE, Sept. 4, 2017 -- Two competitors of drones race talk during the Drone Days 2017 in Lausanne, Switzerland, Sept. 3, 2017. The three days Drone Days 2017 including drones 170904) -- LAUSANNE, Sept. 4, 2017 -- Two competitors of drones race talk during the Drone Days 2017 in Lausanne, Switzerland, Sept. 3, 2017. The three days Drone Days 2017 including drones](https://c8.alamy.com/comp/2RNPNHW/170904-lausanne-sept-4-2017-two-competitors-of-drones-race-talk-during-the-drone-days-2017-in-lausanne-switzerland-sept-3-2017-the-three-days-drone-days-2017-including-drones-race-robotics-showcase-and-flying-trials-concluded-on-sunday-which-drew-more-than-5000-visitors-to-attend-jmmn-switzerland-lausanne-drone-days-2017-xuxjinquan-publicationxnotxinxchn-lausanne-sept-4-2017-two-competitors-of-drones-race-talk-during-the-drone-days-2017-in-lausanne-switzerland-sept-3-2017-the-three-days-drone-days-2017-including-drones-race-robotics-showcase-and-flying-trials-conclude-2RNPNHW.jpg)