First, props to you all for creating the first STEM education SE community. It's a great site with great questions.
Second, how does the community feel about less-pure (in the xkcd sense) biology visitors? I am a full-time biology education researcher and biology lecturer. I'm pretty good at STEM education literature and teaching experience, but I've got no math to speak of.
Do you feel it's appropriate for biology (or physics or chemistry) people to participate? I've felt like I have useful things to say regarding general pedagogy, like clickers or flipped classrooms or exam analysis. And I'm smart enough (I hope) to stay out of the way when math is being discussed. But if you'd rather stick to math expert contributors, I can remain over in Academia SE.