Faced with the choice between changing one's mind and proving that there is no need to do so, almost everyone gets busy on the proof.
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
But I'm thinking about 12 things at once, a hundred thousand times a day. Most people do, I would imagine.

