[laughter] you had another challenge with women we assume we know well, rachel carson, james caddell and alex waters. you were taking a different approach and i thought maybe you could tell us how you came to do that. >> there were four women who had changed the way we thought about this in the environment. there are so many parallels they were in different fields and generations and so all of them are uncredentialed outsiders and people that went into the field and got their fingernails dirty and against all on prevailed. three out of four wrote by comic books that ignited social movements and maybe most interestingly spoken to power when women had no voice and against all odds prevailed. they had this moment in the 60s which really interested. i thought what was it about the culture that allowed these voiceses to be heard and why do they speak to the times so of course i thought my fifth character in the 1960s i started reading their work and the books about them for this character each of these women had been pushing against the values and priorities of the 1950s. the culture is i