Sometime last fall, a man walked into the Nike store in Pasadena, California. He was a runner, it was a running-centric store, and he was there to buy a pair of running shoes just like the ones he had worn in the past. The clerk asked him if he'd be willing to have his feet measured a new way. "I'm a 9," the runner said. "I've always been a 9. Just give me a 9." Still, he relented. The runner walked out with a size 10. What size shoe do you wear? Wait, let's make that more specific.

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