But there was another rationale for the main facility design. ERTS wanted programmers in Houston to identify with the field parties, and if possible to live on their schedules. Inputting baseball games and other local events was discouraged; there was no clock which showed Houston time, although on the far wall eight large digital clocks recorded local time for the various field parties.

The clock marked CONGO FIELD PARTY read 06:15 A.M. when the overhead intercom said, “Dr. Ross, CCR bounce.”

She left the console after punching in the digital password blocking codes. Every ERTS terminal had a password control, like a combination lock. It was part of an elaborate system to prevent outside sources tapping into their enormous data bank. ERTS dealt in information, and as R. B. Travis, the head of ERTS, was fond of saying, the easiest way to obtain information was to steal it.

She crossed the room with long strides. Karen Ross was nearly six feet tall, an attractive though ungainly girl. Only twenty-four years old, she was younger than most of the programmers, but despite her youth, she had a self-possession that most people found striking-even a little unsettling. Karen Ross was a genuine mathematical prodigy.

At the age of two, while accompanying her mother to the supermarket, she had worked out in her head whether a ten-ounce can at 19C was cheaper than a one-pound-twelve-ounce can at 79C. At three, she startled her father by observing that, unlike other numbers, zero meant different things in different positions. By eight, she had mastered algebra and geometry; by ten, she had taught herself calculus; she entered M.I.T. at thirteen and proceeded to make a series of brilliant discoveries in abstract mathematics, culminating in a treatise, “Topological Prediction in n-Space,” which was useful for decision matrices, critical path analyses, and multidimensional mapping. This interest had brought her to the attention of ERTS, where she was made the youngest field supervisor in the company.