Mulan,
We have all the roundabouts(we call them rotaries)here in merry Massachusetts.There are 4 of them in my town alone.It drives us crazy when tourists come and don't know what to do.In the states,you are to yeild to those already on the rotary,where as in other counties,people on the rotary yeild to incoming traffic.Unfortunately for us,people often forget they are in America!
When my sister lived in England,she had a desk job for a while.She had a long day at work,her behind was sore from sitting all day,and her fingers were cramped up from typing.She said outloud "Gosh,I have finger and fanny fatigue!" Let me just say,she got some awful strange looks from her co-workers!!