On The Gist, Mike's thoughts on the P-word. Then, Maria Konnikova of the New Yorker tells us about the challenge of doing a controlled trial on a controlled substance. She's the author of The Confidence Game. For the Spiel, Mike fact-checks a widely ignored statement from Chris Christie. Today's sponsors: Betterment, the largest automated investing service—managing billions of dollars for people just like you. Get up to six months of investing free when you go to Betterment.com/gist. Harry's, the shaving company that offers German-engineered blades, well-designed handles, and shipping right to your door. Visit Harrys.com for $5 off your first purchase with the promo code GIST. Join Slate Plus! Members get bonus segments, exclusive member-only podcasts, and more. Sign up for a free trial today at slate.com/gistplus.

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