Getting to know strangers

If you wanted to know as much as possible about a person, but could only look at one part of there body, what would you look at?

Lungs- you could tell if they were a smoker, if they were an athlete or if they were a coal miner. 

Elbows- Scars and rough skin indicate an active life or a labor intensive profession.

Liver- Damage to this organ may stem from alcoholism or a deficiency/surplus of iron in there diet, probably from being a vegan or a hunter. 

Eyes- A lot of people believe they can tell a lot about a person by looking them square in the eyes.  

Hands- This would be my choice. The lifestyle, diet and attitude of the person can all be deduced by looking at there hands. Strength in the hands would indicate a hard working lifestyle. This would usually be accompanied by calluses. Lack of hand strength may be a sign of a white collar man or a dead beet. If the hands are weak but the nails are cut and the skin is not oily, it is usually a white collar man. Scars on the back of the hands would indicate clumsiness and scars on the front of the hands would indicate motivation. A wedding ring or class ring would also be dead giveaways.