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+I have uncovered strange curious quaint and mystifying facts along this endless trail of progress+ Linkica said. +Have you ever considered why we count from a twelve-digit base?+

+Mathematically it is the best. There are but eleven digits and the zero to remember. Yet still capable of infinite amplitude. Divisible as well by one, two, three, four, and six. A fine base+

+That is all?+

+That is enough+

+Have you never considered that at some time, in the dawn of our race, we must have first started to count and in our simplicity used our fingers as a basic system+ He spread his hands on the table and looked at his dozen fingers. +Could that not be possible?+

+Possible. But just a theory. You might just as well say that if we had had five fingers on each hand we would have used ten as a base+

Linkica's face went white in an instant and he lifted his glass and drained it quickly. Control returned.

+An interesting number. Did you pick it by chance? Or has there been a system of mathematics using base ten in the same manner that computers use base two?+

+I do not remember. But we can find out easily enough+

Dehan strolled across the room to the computer outlet that graced all public places. He was experienced, greatly experienced, at ruthlessly tracking down the most stubbornly hidden facts, and this was simplicity itself in comparison. At all times he knew the right questions to ask. His fingers moved on the control squares constantly, changing the displays at almost the very instant they appeared. Through the local computer to the infinite computer, linked through transmatter connections to all the memory units in the galaxy, to mathematics and history and ever deeper. He returned quickly to the table and sipped his drink.

+An interesting fact discovered. At one time, oh dear, dear, how long ago, the base of ten was universally used. It was replaced by twelve, undoubtedly because of its superiority. So it appears that the finger theory must be dismissed+

+Not at once. My researches have disclosed that at one time a large proportion of mankind had but ten fingers+

+A coincidence+ Dehan did not believe the words even as he spoke them.

+Possibly. But if there is an explanation — what is it? If the two facts are interconnected the resulting logical equation can be read in one of two ways. When the shift from base ten to base twelve occurred there was a resulting change in the number of fingers+

+Highly improbable+

+I agree. Therefore we must consider the alternative that some great mutation, change, or conflict swept the human race. Perhaps there were Opposing groups and the twelves won over the tens in a great war…+

+There has never been a war like that. I would know+

+Of course. But it is an interesting problem+

They sat in silence for a while, sipping their drinks and watching daylight come to the valley below them. The morning fogs burned away as the first rays of the great orange sun struck through the mountain crags. There were crude dwellings beside the river and Dehan touched the window controls. Instantly the image expanded, so enlarged they appeared to be right in among the huts. A blue-skinned aborigine waddled through the doorway, yawning long saurian jaws to show impressive rows of pointed teeth. It picked up a stick and dug at some irritation in the deep folds of skin while looking on coldly at the growing activity around.

+Time bound+ Linkica said. +We were once that way, too. The ontological evidence is clear+

+I do not know what you are referring to+

+These creatures. Their life cycles are bound to the planetary rotation. They sleep during periods of darkness and are awake during their day+

+How unnatural+

+Not at all. It is the natural outcome of a planetary existence. It has taken us thousands of generations to outgrow our dependence upon a waking-sleeping cycle, to reach the present point where we sleep for short periods whenever we feel tired+

+I can imagine no other way to sleep. And if this change were made, what possible reason could there be for it?+

+That appears obvious. The Doors. Their introduction must have altered every facet of existence+

Dehan raised his eyebrows. +Then you are not one of those who believe that the Doors have been with us from the dawn of time?+

+A child's myth. The Doors are artifacts that we still build. Though now they are single unit, solid block, solid-state construction, almost indestructible, they were not always that way. Earlier forms can be found in museums. Have you never wondered why there are always two Doors together, always?+

+I never considered. It is just the natural way of things+

+There is a reason. An engineer told me. Perfect as the Door mechanism is there can be, once in a very long while, a failure of mechanism. If this happens the other Door is always standing ready. There are many places where it would be embarrassing to be without a Door+