Smoke and mirrors: Dave Arnold plays around with liquid nitrogen in a cocktail glass during his interview with NPR's Ari Shapiro. Claire Eggers/NPR hide caption

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Claire Eggers/NPR

From Humble Salt To Fancy Freezing: How To Up Your Cocktail Game

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The Smitten Ice Cream shop in the Hayes Valley of San Francisco serves fresh ice cream with one novel ingredient: liquid nitrogen. The shop is located inside of a repurposed shipping container. Alan Greenblatt/NPR hide caption

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Alan Greenblatt/NPR