ferguson,g unrest in missouri. then our look at president johnson's great society patricia didh stacy harrison. she will discuss the public broadcasting act which provides financial assistance for noncommercial tv and radio broadcasting. after that, tom scully on the creation of medicare under president johnson. as always, your phone calls, facebook comments and tweets. here is a look at our prime time schedule on the c-span networks, starting at 8 p.m. eastern tonight on c-span. a discussion on the safety of genetically modified foods. at 8:30 its book tv with a look at books on fracking and energy. and on c-span3, american history tv with programs on the overland campaign during the civil war, a series of major battles taking place in virginia in 1864. all of that tonight on the c-span networks. securityoday the human