An American professor is sent to darkest Africa to live with a primitive tribe.

He spends years with them, teaching them reading, writing, math, and science.

One day the wife of the tribe’s chief gives birth to a white child. The members of the tribe are shocked, so the chief pulls the professor aside and says, “Look here! You’re the only white man we’ve ever even seen and now this woman gives birth to a white child. It doesn’t take a genius to figure out what happened!”.

The professor replies, “Chief, you’re mistaken. What you have here is a natural occurrence — what we in the civilized world call an albino! Look in that field over there”, the professor says, pointing. “All of the sheep are white except for that one black one there by the tree. Nature does this on occasion”.

The chief was thoughtfully silent for a moment, then says, “Tell you what. You don’t say anything more about the sheep and I won’t say anything more about the baby”.