 So here's a question. Could drones take their place? Cities like Napa, California, and Salt Lake City, Utah have opted out of traditional pyrotechnics this year. They say they're worried about pollution and the risk of wildfires. So instead, they'll create a tribute to America with a light show made by drones. If that sounds lame to you, well, hundreds of synchronized drones create images in the night sky, and they are often set to music.