Here's something interesting.

A new study has found we can actually smell someone's state-of-mind!  No.....really!

Researchers have been testing the ability of people to identify emotional cues from another person based on "chemo-sensory compounds" that are released by the body.  These 'compounds' have no noticeable odor but, nonetheless, transmit info about our emotional states.  Their results show that we, indeed, can distinguish emotional sweat from regular perspiration in both partners and strangers.  And, the ability to do so improves the longer a couple has been together.

Can you imagine what a dog must go through with their nose.   At least we humans have a little more class and don't stick our nose where it doesn't belong...if you know what I mean! :-)