1.   Sperm cells turn out to bear on their surface the same odor receptors stippling the nerves of the olfactory epithelium.

2.   Spicy food, stimulates odor receptors, as all food does, by traveling from the back of the throat up to the olfactory epithelium.

3.   The human nose contains millions of odor receptors.

4.   The story has taken another twist with the discovery that the vomeronasal organ possesses a second set of odor receptors, again with its own family of genes.