For centuries, happiness has been a topic of philosophical and religious debate. But in recent decades, science has stepped in to shed light on its biological and psychological underpinnings. Researchers have discovered that happiness isn't a fleeting emotion, but a complex state of well-being influenced by a variety of factors, including our genes, brain chemistry, relationships, and life experiences. Our brains are the conductors of this orchestra, and the key players in this happiness symphony are neurotransmitters. Think of them as tiny chemical messengers that zip around our brain cells, carrying signals that influence mood, motivation, and even sleep. Two superstars in this happiness band are dopamine and serotonin.