on c-span. comic up tonight on booktv and prime time a look at slavery in america. beginning with a panel on the topic from the ninth annual tucson festival of books featuring jonathan bright and his book. >> its booktv in primetime tonight starting at eight eastern.

>> sunday night on "after words" "washington times" national security columnist bill gertz with his book iwar. >> iwar is really a look at what i feel is the new form of warfare that is emerging in the 21st century. i've covered national security affairs for over 30 years in an all over the world caring these issues because reflection of the information age that we are now looking at this new form of warfare which a call information warfare. i define it as both the technical cyber that we've seen so much of in terms of cyber attacks from the russians and chinese, as well as the content influence type of thing which really emerged in the last

presidential election with the russian, what's been called a cyber enabled influence operation. so these two things i believe are going to be a dominant form of warfare. >> watch sunday night at nine eastern on c-span2's booktv. >> here are some of the programs this holiday weekend on c-span. >> we are currently using the hubble space telescope to study the planets to determine if they have hydrogen helium dominated atmospheres. >> followed by discussion of the pros and cons of genetically modified foods posted by zocalo public square in los angeles. >> those of us who do this we think that all plants are gmos because there's actually nothing that you buy in any of your grocery stores whether it's organic or conventional that hasn't been genetically modified.

>> easter sunday white house easter egg roll events from the last four presidents. >> been a visit to the african-american history museum in washington. >> i knew that the nation was thirsting for this museum but i have to confess i didn't know that the reaction would be dispositive and this strong. >> and at 1:35 p.m. a panel a panel of federal judges discussing the history of the bill of rights. what the bill of rights is it's part of our constitution, is hugely important designation, a division of power. >> followed by a conversation with david skorton. >> our collection is 156 million objects including 2 million books and 154 million other things. >> at 6:30 p.m. eastern presidential historians.

>> it is interesting that the greatest american president abraham lincoln is bracketed by arguably the least successful american president. >> this holiday weekend on c-span. >> the u.s. supreme court is deciding when people can sue police over use of force and what constitutes a dangerous situation. that case, los angeles county v. mendez involves a homeless couple living in a shack in a friends backyard. los angeles county sheriffs deputies looking for a parolee illegally searched the house and a small shack behind it. they entered the shack without a word and without knocking. the deputy shot both people in the shack because one of them was holding a bb gun that he used to kill rats. here's the oral argument in the case. it's about one hour.