[inaudible conversations] okay. Let me check the mic first. Can you hear in the become row . Okay. Im barbara mead. One of the founders of politics and prose and i wanted very much to come in and introduce steven bud dan ski because i enjoyed this book so much budiansky. It was such an impressive accomplishment to write this book. Stephen had to delve deep into mathematics, linguistics, engineering, as well as the technical history of codemaking and codebreaking. From those early electric calculating machines that allen touring was instrumental about, that were used during the Second World War. So much of this is local history, or at least the Second World War part is local history because at that time the nsa was right here on nebraska avenue, where nbc is, and it wasnt until 1957 that they moved out to fort meade. So, in that long history of technology that stephen had to master, he started with those machines that were manufactured by the National Cash Register Company in toledo, oh