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The secret of truffles

To appreciate why truffles, a mushroom-like fungus, can be so pricey, it's necessary to see how they're found. In Italy, Seth Doane joins Natale and Giorgio Romagnolo, fifth-generation truffle-hunting brothers, and their dog, Brio, and meets with Michelin-starred chef Damiano Nigro, for some lessons in a fragrant delicacy.
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