the.com/olfaction
Your brain reading the air's chemical mail, mostly without telling you.
means The sense of smell: detecting airborne molecules and turning them into the perception of odor.
from From Latin olfacere, to smell, fusing olere (to give off odor) with facere (to make) — literally to make a smell happen in your head.
Receptor countHumans wield about 400 working odor receptor types.
Memory shortcutSmell wires straight to emotion and memory centers.
Combinatorial codeFew receptors decode roughly a trillion distinct scents.
Sleep blindSmell barely wakes you; alarms exist for a reason.