A grilled cheese sandwich might seem super simple, but it actually has a surprisingly deep history, science, and even culture behind it. The idea of melted cheese on bread goes back a long time—even to ancient Romans, who combined bread and cheese—but the modern grilled cheese really took off in the United States during the early 1900s. When sliced bread became widely available in the 1920s and affordable processed cheese (like the kind made by Kraft Foods) hit the market, people started making

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