california with a full lineup of author events and call in programs, some of the offers you will hear from with the chance to talk with including hugh hewitt, rebecca solomon, david-- david horwitz and many more. for a complete schedule this weekend's coverage, go to book tv.org. this weekend on our afterwards program representative ken buck, author of drain the swamp any member of the freedom caucus discusses what he finds wrong with washington and how he proposes to change it. you will also hear from the "new york times" on how gene mutation affects our health. historian kevin guzman argues thomas jefferson was a political radical for his time and tom nichols discusses the death of expertise and daniel sharp skeet recalls the wars of the late 19th century. for a complete schedule for our entire weekend check out our website, book tv.org this is book tv on c-span2, television for serious readers.

>> it meant being a washingtonian. it meant being from a liberal family. it meant being the children of my incredibly interesting engaging parents, i mean, it meant-- we all have these identities that are formed by what we grow up with and then there's the identity that you don't realize that you have inherited and that's what the story is from. i didn't understand for most of my life that when i met someone they might come to them meaning of me with a whole set of assumptions or ideas or understandings about this past that i didn't know about. >> watched a thousand times. >> absolutely never watched it until deciding to work on this book, so again in some ways it was a very strange gift for the work because coming to its with

no background in a way, coming to it completely clean meant i-- mind my own memories in a way and then layer in this information i was learning. one of the things i often said about this work as i was doing it was a didn't come to this book with a story to tell. i didn't come to it saying i have this story i need to impart to you. i came to the work with questions and with suspicion and with ideas and the book is the inquiry. the book is the attempt to sort up a together these pieces and one of the things i think is the most most important thing about the work is that i realize when i began reading about the film, sort up with it in mind that i might want to write something about it after my father died, i realized that no one really

talked about it as a home movie and it's interesting that you brought that up. people talk about it as evidence. people talk about it as an artifact that ended up being worth a lot of money. people talk about it as a cultural touchstone for people look at it as a lens through which you can look at media ethics and changing, but for our family and for my grandfather most of all the home movie quality of it, the fact he had been making home movies were 35 years at that point and or 30 years and that it was his camera in his point of view and it was his response ability shaped everything that followed and i think not knowing that and not sort of putting the home movie back at the center of the story, it just meant there wereo many distortions in the way that the story was told in the other public records.

>> you can watch this and other programs online at book tv.org. >> here's a look at authors recently featured on book tvs afterwards, our weekly all the-- author interview program. washer-- washington times provided thoughts on how the us can outpace global competitors in the information age. former chief of the new york police department internal affairs bureau described his work investigating corruption in the police force. road island of senator offered his thoughts on how legislative decisions are influenced to buy private businesses and special interest groups here in the coming weeks on afterwards zero how governor john kasich will reflect on his 2016 presidential campaign. "new york times" correspondent will explore the life of ellen johnson, leader of the liberian women's movement in the first democratically elected female

president in african history. msnbc host chris hayes will look at racial inequality in the united states and this weekend colorado representative talks about corruption in washington and his plans for reform. >> i don't think it's wrong to expect members of the house to raise money for the party to try to win the majority. the same thing with the democrats. i think it's a just part of the reality of politics, but my favorite part of politics but it is part of politics. what i find offensive is the linkage between raising money and assignment to committees work raising money and a chairmanship. or raising money and being in leadership. i think there has to be a merit-based system in place to decide who gets on what committee if you have been a doctor for 30 years and you show up to congress 11x which is in expertise is needed on the commerce committee or another committee. it's not whether you can pay

more money than the doctor, that should not be the determining factor if you make the committee or not. >> afterwards airs on book tv every saturday at 10:00 p.m. and sunday at 9:00 p.m. eastern. you can watch all previous afterwards programs on her website, book tv.org. welcome. good evening, townhall. i am kristin leon, townhall's new community program curator and half at townhall in our community partner and it's my pleasure to welcome you to this evening's conversation with eugenia cheng. this is part of our science series and made possible with support from the microsoft corporation and media sponsorship. first, eugenia cheng will speak for about 35 to 45 minutes and after that we will move into time for questions.