Like a teenager finding his way in the world, the adolescent food industry in the 1950s was trying to figure out how to satisfy customers -- though some of the plans it came up with seem impractical by today's standards. For example, Mayfair Markets in Los Angeles authorized development of "mechanical go-carts" in 1952, which would "enable housewives to remain comfortably seated as they make their selections," SN reported. Testing was delayed, however, "until ...

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