The recent passing of John Glenn, the first American to orbit Earth, and the release of the hit movie “Hidden Figures,” based on the true story of three pioneering African-American women who worked for NASA in the early 1960s, have rekindled interest in the early history of the space agency’s human spaceflight program. William Barry, NASA’s Chief Historian and host Rick Pantaleo talk about some of the early challenges of putting a human in space.