and then helen ocho ya director at nasa space flight center. and later a discussion on the history of executive power. this past week with congress on break, we've been featuring some american history tv's weekend programs in primetime here on c-span3. tonight we look at african-americans' resistance to slavery. starting at 8:00 p.m. eastern, the life and escape of former slave robert smalls who served south carolina in the u.s. house of representatives. and at 10:00 p.m. eastern, vanderbilt professor details how fugitive slaves planned and executed escapes to canada, mexico and the caribbean. american history tv in primetime tonight here on c-span3. c-span2 we've been featuring some of book tv's weekend programs in primetime. tonight or confers with pu lits ser prize winner ana quinned len. it's all that week on c-span2. this weekend head to the state capital named in honor of thomas jefferson with book tv and american history tv in jefferson city, missouri. saturday at noon earn. literariry life on book tv. former senator of missouri first la