We have Charles Hanovera few fascinating fireworks facts for your Fourth of July picnics!

Over the last few decades, states and counties across the U.S. have liberalized fireworks laws. It's just one reason why sales of backyard pyrotechnics have exploded. So what happened to safety over this period?

Music by Drop Electric. Find us: Facebook / Newsletter.

Subscribe to our show on Apple Podcasts, Spotify, Pocket Casts and NPR One.

For sponsor-free episodes of The Indicator from Planet Money, subscribe to Planet Money+ via Apple Podcasts or at plus.npr.org.