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