In the days before computers, Katherine Johnson was a computer. That was a job title for people who made calculations. Many of these were women, and Johnson, now 97, worked on many vital calculations for the American space program for nearly 30 years. Today a building that bears Johnson’s name will house electronic computers performing calculations of their own. The Katherine G. Johnson Computational Research Facility will contain 40,000 square feet of the most advanced computing power in existence today.