Human lacrimal glands secrete an average of 7 cubic centimeters of tears per day. The creator of penicillin, Alexander Fleming, first drew attention to the fact that tears are not "just water." They include the so-called lysozyme, a substance capable of destroying microbes. : In 5-10 minutes, it neutralizes bacteria, including polio viruses. Lysozyme disinfects the eye well. This is why this fragile organ is usually not plagued by microbes swarming in the surrounding atmosphere. Tears are not only secreted through the eyes. Through the through channel, they penetrate the respiratory organs and moisturize the nasal mucosa. Coming into the nose along with tears, lysozyme purifies the air we breathe.