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" ... It turns out that fresh corn, eaten off the cob, isn’t very nutritious. Unlike rice or wheat, it doesn’t seem like a good grain on which to build a civilization. So, one of the linchpins of the ancient cultures of Mexico and Central America was the discovery that grinding the corn, after first boiling and soaking it in a dilute calcium solution, made it easier for humans to digest. This process—called nixtamal in Mexico—made it possible for these people to get all the necessary nutrients from the so-called “three sisters”—corn, beans and squash. The product of this nixtamalization—a dry, stiff dough known as masa—is still the heart of Mexican cuisine. ... "