"So, all I had to do was discover some principal for multiplying a sector of space by the square root of a minus one. As you know, I did that. Then I discovered that there are gaps, so that it was impossible to discover another universe co-existent in space, without determining the basic equation of the time curve. "As everyone knows, both time and space are curved, due to the distortion of mass on surrounding space and time. The exact equation for this curvature had to be determined. "We knew beforehand that it had to be a cubic equation. Each cubic equation has three roots for every value of the independent variable, which is in space. It also has three roots for every value of the time. Basically, that means that if any primal unit exists in our space, it exists in three forms, the positive, the negative and the neutral. These units are the positron, the negatron, and the neutron. Those three are the three solutions in space to the co-ordinates of the existential primal point. "But also there must be two other universes co-existent with ours in space, but separated sideways in time. They would be impossible to find with the machine without solving the cubic equation of the curvature of our time line." "So you have solved that and contacted one of the other two universes," Hute Hitle broke in impatiently. "Exactly," Carl Grinch said. "Take me to it," Hute ordered. "I want to see for myself." "Yes, my Leader," Carl said, clicking his heels again and bowing. The bow was lower than usual to hide the gleam of triumph that rose unbidden in the scientist's eyes. * * * * * The Leader stood with military stiffness, looking curiously at the square of glowing force. It was set flush with the wooden floor of the room, and seemed to be nothing more than a square carpet of luminosity. Near it was a tripod with a telescope attached. The telescope went up to the edge of the space above the square place and seemed to end there,--a tube with no lens in the end. "The telescope is pointed into one of the other two worlds," Carl was explaining. "Without a physical solid connecting the two there is no contact." "What is the nature of that?" Hute asked, pointing at the glowing square surface.