uh-mericans

i work on a uni campus. a uni with lots of internationals. you know the ones that you can pick from across the courtyard? americans. i have been trying to work out why it is easy to tell amongst a group of 100 people which ones the maericans are. is it the fact that they wear track pants where most other's wear jeans? or the fact that they wear shorts and sweater - it's winter people put some long pants on - or is it the hair? i mean, we all have hair, we all use the same brands of shampoo and the same water, go to the same hairdressers, shop in the same places... is it the sweaters that say UCLA? no - those are fashion items available anywhere or for any tourist.
i really can't quite put my finger on it, but i can tell when there are americans in a group, long b4 i hear hem speak. hearing the talk is just confirmation...
do you have a theory?

that is all.