And so we're going to have non covalent interactions between the water molecules and these glycosaminoglycans. So we see that the glycosaminoglycans, as a result of their negative charge, they will be able to actually absorb the water molecule. And so this section will be lubricated with water. Now, what happens when we apply some type of force? So for instance, let's say I jump, and when I jump, what happens is the joints in the knees basically experience an impact force. And what happens is a force is applied onto the agriculture.