I had learned before my CNA class that the body produced three kinds of tears, each with a unique chemical makeup. One of them was generated regularly to keep your eyes moist. The second sprang to life when the eye got something in it, like debris, lubricating and washing out the intruder. The third happened when sadness built up inside you. The chemicals produced through depression were carried out of the body through these tears. You were crying your sadness out.