Google "Ben Carson pyramids" and learn all you need to know. Perhaps future generations will find this story in a footnote on a discarded jump drive and, if they can reconstruct the program needed to read it (and what kind of Rosetta stone will that take?), they may marvel that such people ever had any position of responsibility in our society.*
All I can say is, the M.D. is a professional degree, not an academic one. That explains quite ably, I think, how a man can succeed through medical school and in a highly specialized field of surgery, and still be bughouse crazy.
*and if you don't find out, the idea of pyramids=Joseph's granaries goes back to at least the 6th century, and was popular in Medieval Europe, where they could see the pyramids, but hadn't yet excavated and opened them to find out what they were for. So it's not like Dr. Carson made this up out of whole cloth. Everything old really is new again.
For anybody still interested, Ana Marie Cox has about the best take on this I've found.