Hi all. I've tried to google this, and I've gotten lots of information. Problem is, none of it helped. Pardon the science, but here's my question: at a synapse in the (human) brain, is there a finite supply of neurotransmitters? I.e., is there only so much of a certain chemical available? I'm trying to figure out whether or not it's possible for a human to be infinitely happy, or if there's a biological limit (which is what I suspect).