A new podcast examines how we came to use sirens on all our emergency vehicles, and finds they might actually endanger more people than they help.  

Ben Naddaff-Hafrey is a senior producer, writer, and frequent co-host of the podcast "Revisionist History" with writer Malcolm Gladwell. He also lives across the street from a fire station in Brooklyn. He joined WNYC's Michael Hill to talk about why it might be time to rethink the frequency with which sirens are used.