secrety history

  • You Can Thank Genetic Engineering For Your Delicious Cheese

    You Can Thank Genetic Engineering For Your Delicious Cheese

    It used to be that making cheese meant killing cows. Young cows, specifically — a few days old, at most. The stomach of an unweaned calf produces enzymes that turn liquid milk into good, hard, flavorful cheeses like Parmesan and Cheddar. These enzymes, called rennet, are secreted by mucous membranes that line the calf’s fourth…