Jeopardy!

Sometimes I get the impression that Alex Trebek would know all the answers (er, questions) even if he didn't have the entire board on note cards in front of him. I would love to see how well he would fare in an actual game of Jeopardy! But the problem is that if Trebek were playing, there would be no host. Who could possibly fill the void? No one; Jeopardy wouldn't be Jeopardy without Alex Trebek. But what if you had to pick a replacement? I mean, absolutely had to pick someone to take over. Megan says Bob Barker (if he's still alive). I'm gonna go with Stephen Hawking.