That is really great. I love your emphasis on the challenge and creativity involved. And i guess it underscores a key point especially when were trying to write about enslaved women who are really known to us almost primarily either relationship to someone who enslaved them and you think about the incredible achievement of erika dunbar writing that biography of judge and letting her be an individual in her own right and letting her have her own life when you only have to point of access to her individual voice. Interviews she gave in the mid19th century describing what happened when she ran away from washington so i think you make such an important point about seeing women asindividuals and not just in their relationship to other people so thank you a lot. I want to go back to this question with martha about curvature and asking martha, i want to ask you two things although i want to ask you to be brief about them but the first one is about curvature and if you could quickly, i know yo