Today on The Gist, our in-house vexilologist Ted Kaye explains what images of ISIS flags tell us about the Islamic State's messaging. Plus, David Dunning of the Dunning-Kruger Effect explains why confident ignorance is incredibly common and increasingly harmful. You can learn more in Dunning's Pacific Standard feature "We Are All Confident Idiots." For the Spiel, The Gist gets a new name. 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

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