No No. 2

Iz, from the back seat:

"Mommy, why isn't food more efficient? Why aren't our bodies more efficient? I mean, if our small intestines could just absorb all the food, then we wouldn't need our large intestines at all! We wouldn't need to have anuses! That would be a lot more convenient."

Me (what's there to discuss?): "Yup, you're right. And I'm all for convenience."