Today on The Gist, we ask the Atlantic’s Jeffrey Goldberg whether ISIS is indeed an existential threat to the Middle East. Then, Adam Davidson of NPR’s Planet Money explains how economists talk about taxes when the rest of us aren’t around. Plus, a snappy Spiel about race and long snapping. Get The Gist by email as soon as it’s available: slate.com/GistEmail Subscribe to the podcast in iTunes: itunes.apple.com/us/podcast/slate…id873667927?mt=2