Burn em out - Require fire items for explosives?

[Mello Man]

I've only played this once, and just barely won with the humans. Charging a spawn pit can be tough. I'd be hesitant to house rule that way since there are no buildings where you can pick up light items from the discard pile (at least not in my game, I don't have all of the expansions). But if you're having a real easy time with it, try it out and let us know how it goes. It would certainly make the chemistry teacher much more valuable.