To call “Radio Lab” a science radio show is like calling “This American Life” a radio show about, well, what the hell is “This American Life” about? (Quirky themes? Good stories? Bourgeois dilemmas?) The point is that the best radio shows defy easy categorization. And Radio Lab is definitely one of the best radio shows around. (I’ve been honored to be an occasional contributor to the show.) This is just a friendly reminder that Season Four of Radio Lab is coming up, so if you aren’t subscribing to the podcast on iTunes then you will soon be missing out. And if you’re lucky enough to live in NYC, be sure to check out the Radio Lab premiere party on February 21st at the Angelika.