century tharl list and painter john james otto bon and how he helped pioneer science. >> the really admires his work, artistic work but also his field work. he was very, very good at what he did and he did it with no binoculars, no field guides, no iphone apps and the proof here i think is in the painting. >> and at 8:00 on lectures and history gettysburg college professor on abraham lincoln, slavery are, and the u.s. supreme court scott decision. >> what is tony saying here? there is now no restraint, not even the restant of popular sovereignty on taking slaves into the territories. >> sunday at 10:00 a.m. eastern opening ceremony of the museum of the american revolution in philadelphia with speakers former vice president joe biden, historian and author david mccullough, the museum's

president and koechlt michael quinn and journalist and author cokie roberts. >> it's my hope that this beautiful museum helps inspire you to become those active, involved citizens in this very great country because history has his eyes on you. >> and then at 8:00 on the presidency, author talks about the hard sblg she had been in hospitals, she had her kidneys operated on she had been this dire straits medically so she could relate to the kinds of things they were going through. snou, it was interesting because out of this veteran's cause came the veterans bureau, right, this was the first time the united states hull u actually had a bureau what we would call the v.a. today to take care of veterans. >> go to c-span.org for a complete schedule. sunday night on after words congressman ken buck of

colorado, also a member of the freedom caucus discusses his book "drab the swamp" how washington corruption is worse than you think. >> when you arrive in d.c. and you have the surroundings that i've described earlier, you get very comfortable in that situation and you don't want to give up those comforts. and the way to continue to earn those comforts is to spend more money. and to grow government and to not solve problems but to create programs and take credit for those programs whether they're efficient, effective, to take credit for those programs. and so many of the members of congress are here, it's the best job they've ever had, it's the highest paying job they've ever had, and it's a job that they don't want to give up. and so their re-election is more important than the actual problem solving that needs to go

on in d.c. >> watch after words suntd sunday night at 9:00 p.m. eastern on c-span 2's book tv. c-span where history unfolds daily. in 1979, c-span was created as a public service by america's cable television company's. and is brought to you today by your cable or satellite provider. saturday is earth day and we'll cover the march for science rally including speeches with scientists and civic organizers as well as musical performances live from the national mall in washington, d.c. at 10:00 a.m. eastern on our companion network c-span. this week on q&a, historian david mccullough on his book "the american spirit, who we are

and what we stand for" a selection of his speeches going back to 1989. >> the senator who has been written about the most is joe mccarthy. yet there's no biography of the senator who had the backbone to stand up to him first, margaret chase smith. >> do you remember how you went about preparing for that speech? >> oh, did i go about it. hard as i've ever worked on anything i've ever delivered from a podium. >> historian david mccullough on his book the american spirit, a slesks his speeches going back to 1989, sunday night at 8:00 eastern on c-span's q&a. >> next, historian catherine clinton talks about her book "harriet tubman, the road to freedom" she looks at her role as a conductor on the underground railroad and her life after the civil war. she explores what she argue are historical mi