He saw that since each man had a father, and so on and so on, it ought to be possible to construct the genealogy of every person now alive. In short, it should be possible to trace your family back, father by father, to the beginning of time.

And of course it was. For that was the era of the time scanner. And with a time scanner, it would be possible to document your family tree with perfect accuracy. You could find out exactly from whom you had sprung.

And so Thatcher Blitt made his fortune. He saw clearly at the beginning what most of us see only now, and he patented it. He was aware not only of the deep-rooted sense of snobbishness that exists in many people, but also of the simple yet profound force of curiosity. Who exactly, one says to oneself, was my forty-times-great-great-grandfather? A Roman Legionary? A Viking? A pyramid builder? One of Xenophon's Ten Thousand? Or was he, perhaps (for it is always possible), Alexander the Great?

Thatcher Blitt had a product to sell. And sell he did, for other reasons that he alone had noted at the beginning. The races of mankind have twisted and turned with incredible complexity over the years; the numbers of people have been enormous.

With thirty thousand years in which to work, it was impossible that there was not, somewhere along the line, a famous ancestor for everybody. A minor king would often suffice, or even a general in some forgotten army. And if these direct ancestors were not enough, it was fairly simple to establish close blood kinship with famous men. The blood lines of Man, you see, begin with a very few people. In all of ancient Greece, in the time of Pericles, there were only a few thousand families.

Seeing all this, Thatcher Blitt became a busy man. It was necessary not only to patent his idea, but to produce the enormous capital needed to found a large organization. The cost of the time scanner was at first prohibitive, but gradually that obstacle was overcome, only for Thatcher to find that the government for many years prevented him from using it. Yet Blitt was indomitable. And eventually, after years of heart-rending waiting, Genealogy, Inc., began operations.

It was a tremendous success. Within months, the very name of the company and its taut slogan, "An Ancestor for Everybody," became household words. There was but one immediate drawback. It soon became apparent that, without going back very far into the past, it was sometimes impossible to tell who was really the next father in line. The mothers were 

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