Olfactory Maps. Bones of salmon embedded in dark rivermouth sand speak in an international ecological language and tell the plight of a creature whose natural passage along riverways is often threatened by pollution and blocked by dams.

Salmon accurately navigate vast distances of relatively featureless ocean. Whether guided by the sun's position, water currents, magnetic forces, or the exact smell of their riverof birth, they swim across seas to spawn in the same creek where they were born. --B.I.

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Inhaling and exhaling we smell odors. Smells coat us, swirl around us, enter our bodies, emanate from us. We live in a constant wash of them.

-- Diane Ackerman