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We sized up refrigerator shelves In 1951 using the milkman's quart bottles; today we use gallon jugs and portly three-liter soda bottles. We still load freezers with frozen food and wire them--and the refrigerator--with special temperature-measuring instruments.
In 1951, maintaining 10[degrees]F was a tall order for freezers. Now we expect 0[degrees]F, which holds the quality of frozen foods longer; all freezers pass ...