On The Gist, Mike asks Maria Konnikova of the New Yorker to examine the research into the link between age and fertility for men and women. She's the author of The Confidence Game, now available for preorder. For the Spiel, Mike's true psychic abilities proved by the Republican debates. Today's sponsors: Stamps.com, where you can buy and print official U.S. postage right from your desk using your own computer and printer. Use the promo code THEGIST to get a no-risk trial and a $110 bonus offer. Squarespace.com. Get a free trial and 10 percent off your first purchase when you visit Squarespace.com and enter offer 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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