Today on The Gist, how the alchemy of two helps creativity thrive. Joshua Wolf Shenk, author of Powers of Two, explains how genius comes in pairs. For the Spiel, the problem with defending the indefensible use of a chokehold. 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