Skeptical Comedians are certainly not the sort of people I'm talking about. I love skeptical comedians, but they generally put being funny ahead of being scientific. Not that there is anything wrong with that. Dara O'Briain is the only comic I can think of who is consistently both funny and skeptical, and he certainly has a "shitload of knowledge" -- come to think of it, he actually is the sort of skeptical ambassador I am thinking of.