Comments

These pictures are real representatives of different emotions producing different tears. It's true with all continuous body fluids (e.g. sweat and saliva), hormones change them. Smell someone who's actively working out and someone who's been sitting in a hot room, both are sweaty but smell different and the dried residue of their sweat will also be different. You can buy a fertility like test for women that they just spit in, look at the dried saliva and depending on the way it looks when dry, the women can get an idea if she's ovulating.

Or "I was born in France."

Normally you just say "I'm from France."