What's up with Bob Costas' hair?

Have you been watching the Olympics over last few days and noticed there's something not quite right about anchor Bob Costas' hair? We here at The Bitter Producer did as well and decided to take action. We sent some recent footage of Mr. Costas to the nation's top dermatologists at Johns Hopkins University for some analysis. After much study and debate, the doctors have come up with three possible theories. Here they are in no particular order...

a) Our eyes are not used to seeing Bob in glorious High Def and it's distorting our image of him
a) Bob has begun dying his gray hair a very dark shade of shoe polish black
c) A small woodland creature has taken up residence on top of his head