why in the world you have so many neurons—brain cells!—in your stomach, of all places.
The human gut is lined with more than 100 million nerve cells—it's practically a brain unto itself. And indeed, the gut actually talks to the brain, releasing hormones into the bloodstream that, over the course of about 10 minutes, tell us how hungry it is, or that we shouldn't have eaten an entire pizza. https://www.science.org/content/article/your-gut-directly-connected-your-brain-newly-discovered-neuron-circuit
