For decades, many of the most profound human innovations have demanded an inhuman precision. From contours that reduce a car's drag to the invisibly tiny features on a silicon chip, today's technological wonders would be impossible to fabricate using eyes and hands alone. Manufacturer John T. Parsons helped boost human production ability as a pioneer in computer-aided manufacturing. By translating machine motions into a set of numbers, Parsons taught machines to build machines.

In 1947, John Parsons headed the Parsons Corporation plant in Traverse City, MI, which produced helicopter rotors. At the time, digital computers were still gymnasium-sized affairs, but punch-card-operated electromechanical calculators were used by accountants. Parsons rented an IBM accounting machine to crunch some design parameters, since the shape of his rotor blades was defined by complicated equations. No one suspected that the machine would ultimately help Parsons produce finished parts with unprecedented accuracy and speed.