It’s not a pleasant thought, but you’ve got billions of tiny critters living in your mouth. An entire ecosystem of bacteria live in there, and many of them have important roles in chewing and digestion. Now, scientists have found that bacteria in the mouth play a role in creating the distinctive flavors of certain foods.

Intro theme and various sound effects by Adam Dylewski; music by admiralbob77 (via ccmixter.org); Creative Commons licensed audio from freesound.iua.upf.edu includes sound by koops and zerolagtime.