Your brain is not one big electrical signal. It’s actually hundreds of chemical conversations happening at once. These chemicals are neurotransmitters, and they control everything from motivation to movement. You’ve probably heard of dopamine and serotonin. Dopamine gets called the “pleasure” molecule and serotonin the “happiness” molecule. While those labels have tiny grains of truth, they’re mostly oversimplified marketing slogans. The real science is far more interesting,