When a woman gives birth to a child, the child needs to be able to digest the mother's milk; but when this child is old enough to begin to eat other foods, there is some switching off of this ability to consume milk.
“I'm a professional geologist, an explorationist for oil. That's what I've done in my career, one that's culminated in - at least to this point - playing a part in finding the largest field in the last 40 years anywhere in the world. That's the Bakken field, which I believe will yield 24 billion barr”