The bob is 100. The cropped hairdo, inspired by Joan of Arc, was invented in 1909 by a Parisian hairdresser, gained popularity with Bloomsbury bohos and later with flappers, Anna Wintour. [The F Word]
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I can't imagine having short hair. Mine has been waist-length for as long as I can remember. Of course, in this recession a bob would probably be better as I get through about a bottle of shampoo every four days.