On The Gist, Mike discusses the fast-moving field of cancer research with doctor Vincent T. DeVita, and his daughter, science writer Elizabeth DeVita-Raeburn. Together they wrote The Death of Cancer. For the Spiel, a rhyming response to Keith Ablow's comments on Fox News. Read more of Slate's coverage of the San Bernardino shooting. Today's sponsors: Casper, the online retailer of premium mattresses for a fraction of the price. Get $50 toward any mattress purchase by visiting casper.com/gist and using the promo code 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 THEGIST. 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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