Zipline drone takes off in Ghana, April 22, 2019. Picture taken April 22, 2019. Zipline drones, supported by Gavi and the UPS Foundation, cut the time taken to deliver lifesaving medical supplies from hours to minutes. Gavi/2019/Tony Noel via REUTERS   ATTENTION EDITORS - THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. MANDATORY CREDIT