The chieftain quickly figured the voluntary doctor from Europe might be to blame. So the chieftain asked him to talk in his tent.
Chieftain: “Today my wife gave birth to a white child. She and I are dark skinned. You are white. It doesn’t take a doctor to figure out that you have slept with my wife!”
The doctor remains calm: “The answer lies in the genetics. Some genetics have recessive traits, which are not apparent to the parents but may be passed on to the child. For example, last week one of your sheep gave birth to a black sheep.”
The chieftain pauses for a thinking, then replies: “I tell you what. You say no word about black sheep and I say no word about white child.”