In this gourmet era, canned food doesn’t get much respect. But that humble tin of chicken soup in the pantry has a fascinating backstory. Canning was invented to feed soldiers during the French Revolutionary Wars. And the commercial canning industry that followed was, at first, a dicey business. Historian Anna Zeide talks about her new book, “Canned: The Rise and Fall of Consumer Confidence in the American Food Industry.” Original air date: 6/19/18