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When you saw watson, it's the size of an rv, it's like a whole room, tens of millions, 3000 processers, trying to defeat one human brain. it makes you think there is something great we have going on. jenna: how did you prepare? >> i watched a lot of jeopardy. i hadn't been on the show five years and i felt rusty. i needed to get my mo skpwr-fplt o -- my mojo back i use a ball point pen. that's the key. jenna: ball point pen, who knew. one point final, alex trebek or jon scott, who's the better host? >> i'm a fan of alex trebek so you're going to have to get facial hair to compete in my mind. j...

When you think about watson's spaoez and reflections on the jeopardy buzzer. it's hard -- it's hard to have reflections as precise as a computer. jon: that's unfair because you have to make your thumb work and how does watson do it. >> the thing is watson is a robot, he has a mechanical thumb that buzzes, i can hear a clicking on the buzzer every time it tries to buzz, so a creepy robot sound next to the podium. jenna: and watson tried to make small talk during a commercial. >> small talk is low. he's not really an extrovert. jenna: does the computer make any mistakes, are there mistakes to be...