What do we need sinuses for, anyway?
n the first chapter of The Descent of Man, Charles Darwin identified roughly a dozen anatomic traits that he gleefully described as “useless, or nearly useless, and consequently no longer subject to natural selection.” The list included body hair, wisdom teeth, and the coccyx—superfluous features that served as Exhibit A in his argument that humans did not descend from “demigods” but rather from a long line of fur-insulated, plant-chewing creatures that sported tails.
A tiny pit on each side of the septum is lined with nonfunctioning chemoreceptors. They may be all that remains of a once extensive pheromone-detecting ability.
clipped from: notes.utk.edu 
