 physiology. It becomes more rigid and it becomes more stiff. A lot of people have heard of hyaluronic acid. It's in a lot of beauty products, etc. But it's a very important substance in our body. Hyaluronan, glycosaminoglycans, that is kind of our motor oil. That's the substance that allows these things to move separate of one another. However, in these situations, like I was mentioning earlier, the hyaluronan can