I do have a huge fascination for science, and I love to hear what my dad has to say. He used to take me into minor surgeries when I was a kid and let me watch, so I definitely have a passion for it, but it's not as big a passion as I have for acting and creating characters.
In improv, the whole thing is that it is a relationship between the two people, as a back and forth. In standup, you don't really want to be listening to what somebody is saying; you want to project your jokes into their face. And that's really not a good instinct with a 'Daily Show' field piece, where it's supposed to be an interview.