2A, what? No heck, what is Serotonin first? Okay, let's get slowly there.HelloEver felt happy after receiving an Amazon package waiting for a week? Serotonin. Ever ate your favourite chocolate and felt a rush of joy? Serotonin. Ever had your heart skip a beat when your crush asked you out for coffee? Serotonin. Ever felt...you get the idea. If Dopamine if your reward molecule, Serotonin is your "happy" molecule. (Ofcourse, it is much more complex than that, but to first degree of approxi...