Immediately upon learning that there's such a thing as a menstrual cup, Mike Pesca had to ask Slate's L.V. Anderson to explain. Learn why the DivaCup and Keeper Cup are growing in popularity, and why a new Kickstarter campaign for the Looncup might not make it out of the prototyping stage. Plus, the return of Munitions News. Dr. Rebecca Grant of Iris Research joins us for a round-up of rounds. For The Spiel, what it really means to flip one's bat. 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. 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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