After days of smoky conditions caused by Canadian wildfires, some U.S. cities are looking to play it safe this Fourth of July with innovative alternatives to their fireworks displays.

There's lots of talk about China supplying weapons to Russia for its war in Ukraine. But one Chinese product already plays a key battlefield role - a cheap, popular, off-the-shelf, commercial drone.

Drones represent the fastest-growing segment in the entire transportation sector. Companies such as Amazon, Walmart, and UPS have started testing drones to deliver goods to customers.