That was fast–I was just on the Brian Lehrer Show on WNYC to talk about smiles, and they’ve already posted the conversation on their site. You can listen to it there.

A few minutes in, we talk about a mashup of Obama smiling in White House photos that’s been floating around (see below). When I pointed it out to Paula Niedenthal, my main source for my Times article, she likened his smile to the way we say hello on the phone. It always sounds the same, but that sameness doesn’t say much of anything about our emotional state.