. >> i'm so sorry that we don'trem have any more time perwill be questions. tebow be back. th thank you very much.ank [applauding] muh. [applauding] >> for more on sam harris and his work visit sam harris got org. >> you're watching book tv on c-span2. forty-eight hours of nonfiction books beginning every saturday at 8:00 a.m. here's our primetime live for tonight. beginning at 7:00 p.m. we look at john wilkes booth family and examine the relationship between john and his older brother, one of the most successful actors of his day. at 8:00 pauline man, american history professor at mit presenting the history of the ratification process of the u.s. constitution. recounts the yearlong debate that took place throughout the country following the constitutional convention as the newly released document was poured over by the citizenry. following that ron christi, founder of acting white. he traces the history and use of the phrase acting white. he is interviewed by janet cohen , a political activist and wife of former defense secretary bill . we will wrap up the evening with eve