The smartly dressed middle-aged man, looking a bit like a banker, charges past rows of salad dressing and diapers in the suburban Virginia Safeway, a plastic grocery basket swinging at his side. He scans the produce section until he finds what he has come for: turnips. He examines them one by one. "Too big means the root is too tough inside, too small you've got nothing left once it's peeled," the man explains as he fills up a plastic bag and twists it closed.
He is on a mission. In ancient Persian medical lore, turnips are just the thing for a...
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