“Don’t talk with your mouth full” is an expression we’ve all heard. And if we have children or younger siblings, we’ve also spoken it.  Did it arise out of decorum so the listener is not visually confronted with half eaten food or worse, spat upon? Or was it addressing the resulting mumbled and garbled speech? Or was it a medical admonition to prevent choking? The origins are unclear, but it’s fascinating to give consideration to our human design that has food, water, and air all having a common entry point into the human body.