brenda stevenson teaches histories. what courses to due teach? >> here i teach course's on slavery and women's history and interracial dynamic. >> how long have you been here. >> guest: 26 years. >> oh husband is changed. >> guest: tremendously. it's gone in student population, grown in the kind of students we have. it's grown in the kinds of faculty we have and the kind odd of thinkings we focus on in the history department which is where my heart and is my mind is as well. it's been a wonderful time to be here, though, just seeing the change be and being part oftite you came they ever year before the l.a. riots. >> guest: i did. it was quite a shock to move from texas, where i was, having been born and raised in virginia, and coming here and being part of that. seeing it first hand. >> host: have you written about that? >> guest: yes, i have. i was so impacted by it that i had to write a book called the contested murder of latasha harlan." i wrote a book published in oxford university press in 2013. >> host: who was la at-ha harlan. >> guest: s

. >> brenda stevenson teaching history at ucla. the most recent book what is slavery. this is book tv on c-span2. [inaudible] that we are having this conversation today and we will try to get back to you is the ten-year anniversary of the debut of the iphone. with that in mind, we are pleased to be welcoming back andrew mcafee. we hosted them for their second book and now they are back tonight with a follow-up of sorts and that book is the machine platform crowd the digital future which we have for sale following the conversation. with a further introduction, the research scientist and director on the digital economy at mit and both of them on how it is changing business economics. joining them on stage tonight is a reporter where she covers the start of economies from the magazine where she wrote about business economics for the funny box column. we have copies of the book for sale following the conversation and they will stick around and autograph them for you and without further ado. [applause] thank you all for coming, start by telling us a little bit about your bo