http://media.slate.com/media/slate/Podcasts/Explainers/SE090106-EmptySeats.mp3 Explainer: Uh … Mind if I Sit Here? http://www.slate.com/id/2207908/ 2009-01-06 http://media.slate.com/media/slate/Podcasts/Art/Explainer/iTunes_Explainer_300x300.png