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Fear, love, happiness, motivation, anxiety, attachment. All of these deeply human experiences can begin with molecules so small that they are invisible to the naked eye. Hormones are the body’s chemical messengers. They can accelerate your heartbeat, alter your behavior, influence memory, appetite, and even change the way you perceive reality. Adrenaline prepares us to fight or flee. Dopamine drives us toward goals and rewards. Oxytocin helps create trust and emotional bonds. Behind every emotio