 And a rare double brood of cicadas around St. Louis has been making a lot of noise. Reporter Zach Dyer with our partner KFF Health News has the story. To get a lesson in cicada appreciation, I met up with Casey Fowler-Finn. She's a biology professor at St. Louis University. If you're not used to listening to insects sing, it might just sound like a big cacophony. But if you listen close, you can hear all the subtleties of the different species, which is pretty cool.