> 80 million neurons With, each, more than 60 different types of neurotransmitters, exocytosis, endocytosis, transporters, destructive enzymes, pre- and postsy

> 80 million neurons With, each, more than 60 different types of neurotransmitters, exocytosis, endocytosis, transporters, destructive enzymes, pre- and postsynaptic receptors, ~7000 connections to other neurons and much more I did not think of, even a single neuron is an unbelievably complex machine all by itself.