When a grilled chicken and arugula salad ordered at a large chain restaurant came out with yellow leaves, I pointed out that, “It looks like the arugula has gone bad.”“It’s supposed to look like that,” the server answered with a know-it-all smirk. “It’s wilted arugula.”“Wilting arugula doesn’t turn it yellow,” I explained. “In fact arugula turns darker green when wilted. Old and rotted arugula, on the other hand, turns yellow.”The waiter took the meal back to the kitchen in a huff, and ...

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