Shooting off fireworks has been a big part of how Americans celebrate Independence Day since the very first anniversary of Congress’ fateful declaration. John Adams wrote that the occasion “ought to be solemnized with pomp and parade, with shews, games, sports, guns, bells, bonfires and illuminations.” Today, fireworks are big business, with adults setting off an average of 1 pound a year. Ohio State economist Jay Zagorsky reveals that and several other interesting facts about Americans’ love of pyrotechnics.

Before you head outside today, read UC Riverside chemist Kerry Hanson’s article on what happens when sun meets skin – and how traditional sunscreens protect you. And, if you are concerned what the chemicals in your sunscreen are doing to the corals and critters near the shore, check out the research by University of Florida scientist Yousong Ding whose lab has discovered a safe natural sunscreen made by microbes.

When it comes to symbols of American culture, Route 66 is up there with baseball and apple pie. So you may have assumed that when the House of Representatives recently passed a bill to designate Route 66 a National Historic Trail, it was simply a ceremonial piece of legislation. But many parts of the legendary highway have fallen into disrepair, and some aren’t even traversable by car. Arizona State Ph.D. student Daniel Milowski explores the significance of this legislation – and how it could revive many of the struggling small towns along Route 66.

Happy July 4th from all of us at The Conversation!