I don't know... Game shows always have the potential to be rigged so that's not a very solid reason to think he's the smartest person on earth. I think if Ken really was the smartest man, we would have seen him make great social contributions but I only know him as the man from Jeopardy. Hehe, probably not the smartest person ever. He did donate a ton of the money he won to charity so he's thumbs up in my book.