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“As the shoe works hard to keep its grip, tiny sections of the sole change shape as they momentarily lose then regain contact with the floor thousands of times per second — at a frequency that matches the pitch of the loud squeak we hear.” A Boston Celtics game-inspired friction test finally pinned down the sneaker squeak.

+ You Want a Lot of Iced Coffee? Dunkin’ Has a Bucket for You. (Toss in a few shots of espresso and I can finish the whole newsletter on one serving.)