Attention, French natives: Do you mind if I ask you guys a personal question? How often do you folks  wash your hair?No, I'm not trying to raise hackles (or plumes de cou, for that matter), but I recently read a  factoid online stating that 90% of Americans wash their hair every day. Well, let me tell you: never  have I felt so American in my entire life. I myself have been performing such abluti…