environment, the federal government needs to contribute to the issue at hand to preserve now for the future. >> can you name me any piece of open space, any in the town, state, country, that was purchased as open space, usually after a long fight, that the next generation regretted? ♪ >> to watch all of the prize-winning documentary's end this year student cam, visit studentcam.org. announcer: join us later today when former pakistani president combating isis as well as u.s. foreign policy in general. he speaks of george washington university's national library and center today at 6:00 p.m. eastern time and you can watch live here on c-span. join us at later tonight for remarks of an holton, wife of

senator tim kaine, and virginia's education secretary from 2014-2016. recently she spoke about access a public education from 1950's to today at an event organized by harvard university in cambridge, massachusetts. here is a preview. holton: we have urban infrastructure, urban aging, expensive infrastructure in our urban core. we have kids with a multiplicity of challenges, and maybe even more than barbara johnson's day where we had more intact communities, and on top of all that, we have systems pushing great teachers out. part of that is good news, great teachers can get jobs everywhere now regardless of color, and dorothy von was able to work at langley and help get the man on the moon come up with the

challenges now of fighting for equal, great teachers, great curriculum, great facilities in our urban core is a very challenging one. announcer: that was a short portion of an holton's remarks. watch the entirety tonight at 8:00 p.m. eastern here on c-span. some of theere are programs this holiday weekend on c-span. 8:00 p.m. eastern, nasa briefing on the discovery of seven earthlike planets orbiting a nearby star. >> we are using the hubble space telescope to determine if they have hydrogen or helium dominated atmospheres. announcer: followed by a discussion on the pros and cons of genetically modified foods in los angeles. >> those of us who do this, we think that all plans are gm o's because there is nothing you buy in your grocery stores that hasn't been genetically modified. announcer: easter sunday at 10:30 a.m. eastern, the white

house easter egg roll event for the last four presidents. then, 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 did not know that the reaction would be this positive and the strong. p.m., federal1:35 judges discussing the history of the bill of rights. >> what the bill of rights is is part of the whole constitution, , hugely important designation division of power. announcer: followed by a conversation with the smithsonian institution. the lebron of congress, and the archivist of the united states. is 150 6llection million objects, including 2 million books and 154 million other things. announcer: at 6:30 p.m. eastern, discusstial historians

presidential leadership. >> it is interesting that the greatest american president, byaham lincoln, is bracketed arguably the least successful american president. announcer: this holiday weekend on c-span. check out our c-span classroom website at c-span.org/classroom. it is full of free teaching resources for c-span classroom members. the improved layout gives teachers to ready to go resources for the classroom, including short current events videos that highlight important events in washington dc, constitution clips that bring the constitution to life, social studies lessons plans, as well as on this day in history resources. our search function allows c-span classroom teachers to search and tilted by date, person, keywords come a topic, and grade level -- keywords,

topic, and grade level. short videos paired with particular and discussion questions that make the federal government and politics more accessible to your students. the bell ringers. a lot of times they don't use them as actual bell ringers, but i will use them in conjunction with an activity we are doing that day as more like a wrapup. >> the new website is something that is just fabulous. my students use it regularly. it is so easy in fact that they are right now working on clipping videos and making questions that they can design and turn into their own bell ringers. >> probably my favorite aspect perfectly set up ready to go classroom deliberation classroom discussion on just a variety of topics that are current and relevant today. announcer: if you are a middle school or high school teacher, join thousands of your fellow teachers across the nation as a mentor -- member of c-span classroom. it is free and easy to register at c-span.org/classroom.

you can request our free classroom american presidents timeline poster, a graphic display of the biographies of all 45 presidents. find more about it at c-span.org/classroom. now a discussion on the progressive movement and the trump administration from today's washington >>