So it's very, very important for our body to be able to control and regulate and prevent these drastic changes in PH from happening. Well, as we'll see in just a moment, our body uses buffer system solutions that contain buffer systems. And we'll see what that means in just a moment. First, we want to basically ask and answer the following question if the solutions in our body consisted of nothing but pure water, would that be a good system to actually help prevent these drastic changes in PH? So, for instance, let's suppose we're inside the nucleus of our cell. And inside the nucleus, we have nothing but the DNA molecules and pure water.