eating and mouth

As you sit at mealtime, enjoy your pizza, grilled chicken to you and your orange. After devouring all these delicacies, the auction fatigues with a glass of milk, you clean your mouth and you go to the next class. Within a few minutes thinking about your city or your favorite work of science. You've completely forgotten what you just eat. But you'll still in the stomach - a kind of scientific experiment that happens constantly.