 that we need to pay attention to. In fact, there really are intelligence. When you look at the human body, I found out that our human body is made of 6 trillion human cells, but we have 60 trillion bacterial cells in us and 360 trillion virus cells. So by count, we're actually more virus than bacterium. And these bacterium are in our mouth, that's called our oral microbiome, and they're in our gut.