leah greenberg will be joining us.e is will -- she is with the invisible project. -- the indivisible project, i should say. later, dennis prager will be joining us. our c-span cities tour continues as we explore the history of communities, including charleston, west virginia. charleston to to look at the story of catherine johnson, who was a research mathematician playing a pivotal role in our space efforts. [video] >> what is the status on the computer? >> it is right behind you, mr. harrison. >> there are people right here in west virginia that have no idea of what catherine johnson did for nasa and united states of america. when the movie hidden figures came out, it showed everyone who catherine johnson was, what she did and how profound she was in the pages of american history. she was hired is what they called than a computer. sheik simply kicked -- she simply came in and did mathematic equations. she was more than just a computer. she was a mathematical genius. that is what catherine johnson was. 5, 4, 3, 2, 1, 0