<p>On the fourth leg of our road trip, we figure out where traffic comes from and what it would take to make it finally go away.</p>

Brains On! Science podcast for kids

Traffic: Phantom jams and chicken soup (Road trip pt. 4)

Brains On!® is a science podcast for curious kids and adults from American Public Media. Each week, a different kid co-host joins Molly Bloom to find answers to fascinating questions about the world sent in by listeners. Like, do dogs know they’re dogs? Or, why do feet stink? Plus, we have mystery sounds for you to guess, songs for you to dance to, and lots of facts -- all checked by experts.