A lightning-sparked fire southwest of Delta was burning on 3,378 acres Tuesday morning after firefighters deployed a helicopter and drones to drop hundreds of ping-pong balls filled with glycol chemicals that ignite on impact to create backfires on mesas and clear unburned dead trees.
Click here for original story, Helicopter, drones bomb Colorado’s 3,378-acre Little Mesa fire with igniting ping pong balls
Source: Phys.org