Pheromones — the molecule is the message

A pheromone is chemistry acting as language: a molecule IS a signal. Sealed: a 20-component blend encodes 2^20 = 1,048,576 distinguishable messages (~4.3 bits per component), and an ant's trail evaporates exponentially — at 90% per step, a ~6.6-step half-life (https://narrowhighway.com/s/cf33ee4a141a5eec4532535efbd2b7e5563cc8ac04c39c530d03c5b3806ebc45). That decay is not a flaw, it is the ALGORITHM: because old trails fade, a colony with no map converges on the shortest path (ant-colony optimization is a real algorithm lifted from the ants). A male silk moth detects a few molecules of bombykol — near single-molecule sensitivity. Pheromones DIFFUSE down a gradient (the continuity/diffusion equation) and DECAY (the exponential clock) — the fluid and the clock of this whole map, carried in a scent. The deep point (Matt: 'pheromones act as signals'): a pheromone is one member of a single family — the SIGNAL, a physical carrier of information across a channel. Radio waves (EM), DNA (genetic), morphemes (linguistic), neurotransmitters (neural), and the sealed receipt of this very engine (cryptographic) are all the same abstraction — Shannon's channel. The pheromone is the chemical dialect of one universal grammar: information, carried. Honest boundary: the information math seals; which molecule means what is discovered biology (measured), and whether true HUMAN pheromones exist is genuinely contested — INCOMPLETE. Signpost: creation communicates, down to the ants.