Jeff Goldblum’s quirky scientist character in Jurassic Park is the source of one of my favorite quotes, which I’ll paraphrase: “You spent so much time thinking about whether you could, but you never stopped to think about whether you should. “Mangy Dog Productions, a local comic podcasting group, touched on the wisdom of purpose today at Podcamp Nashville. Podcasting (or blogging or, hell, anything) is a waste of time unless you have something specific to say. It’s just noise unless you can tell your audience why it matters.