60% of our immune system is located in and around our gut. The reason it's clustered, I believe, around the intestinal tract is because an average person will consume somewhere between 10 and 20 tons of food. So we have all this innate immune system activity sitting there with their antennae up waiting to see if a friend or a foe is going to arrive. And if it's a foe, it's going to signal the rest of the body, get ready. We've got a battle going on. What's going on? Wow.