The other day a colleague told me he had a theory.
“What’s your theory?” I asked.
He said his theory was that some children like to eat dirt because they have an instinct to develop defenses against micro-organisms in their environment. It is a way to ensure the continued survival of the species.
“That makes sense,” I said. “And I have another theory.”
“What’s your theory?” he asked.
“My theory is that some parents like to stop children from eating dirt because they have an instinct to prevent the continued survival of the species.”