"Anyhow, the main point for the present is that something happened. Chris Danchekker has shown…" Another file reference appeared on the bottom of the screen. "… that all the higher, air-breathing Minervan life forms would almost certainly have possessed a very low tolerance to increases in carbon-dioxide concentration. This derives from the fundamental system of microchemistry inherited from the earliest ancestors of the line. This implies, of course, that the changing surface conditions on Minerva posed a threat to the very existence of most forms of land life, including the Ganymeans. If we accept this situation, we also have a plausible reason for supposing that the Ganymeans went through a phase of importing on a vast scale a mixed balance of plant and animal life from Earth. Perhaps, stuck out where it was, Minerva had nothing to compare with the quantity and variety of life teeming on the much warmer planet Earth.

"Evidently, the experiment didn’t work. Although the imported stock found conditions favorable enough to flourish in, they failed to produce the desired result. From various bits of information, we believe the Ganymeans gave the whole thing up as a bad job and moved out to find a new home somewhere outside the Solar System. Whether or not they succeeded we don’t know; maybe further study of what’s in the ship will throw more light on that question."

Hunt stopped to pick up a case from the desk and went through the motions of lighting a cigarette. The break seemed to be timed to give the viewers a chance to digest this part of his narrative. A subdued chorus of mutterings broke out around the room. Here and there a light flared as individuals succumbed to the suggestion from the screen. Hunt continued:

"The native Minervan land species left on the planet soon died out. But the immigrant types from Earth enjoyed a better adaptability and survived. Not only that, they were free to roam unchecked and unhindered across the length and breadth of Minerva, where any native competition rapidly ceased to exist. The new arrivals were thus free to continue the process of evolutionary development that had begun millions of years before in the oceans of Earth. But at the same time, of course, the same process was also continuing on Earth itself. Two groups of animal species, possessing the same genetic inheritance from common ancestors and equipped with the same evolutionary potential, were developing in isolation on two different worlds.

"Now, for those of you who have not yet had the pleasure, allow me to introduce Cyril." The picture of Hunt vanished and a view of the man-ape retrieved from the Ganymean ship appeared.

Hunt’s voice carried on with the commentary: "Chris’s team has made a thorough examination of this character in the Jupiter Four laboraties. Chris’s own summary of their results was, quote:

"‘We consider this to be something nearer the direct line of descent toward modern man than anything previously studied. Many fossil finds have been made on Earth of creatures that represented various branches of development from the early progressive apes in the general direction of man. All finds to date, however, have been classed as belonging to offshoots from the main stream; a specimen of a direct link in the chain leading to Homo sapiens has always persistently eluded us. Here, we have such a link.’ Unquote." The image of Hunt reappeared. "We can be fairly sure, therefore, that among the terrestrial life forms left to develop on Minerva were numbers of primates as far advanced in their evolution as anything back on Earth.

"The faster evolution characteristic of Minerva thus far was repeated, possibly as a result of the harsher environment and climate. Millions of years passed. On Earth a succession of manlike beings came and went, some progressive, some degenerate. The Ice Age came and moved through into its final, glacial phase some fifty thousand years ago. By this time on Earth, primitive humanoids represented the apex of progress-crude cave dwellers, hunters, makers of simple weapons and tools chipped out of stone. But on Minerva, a new technological civilization already existed: the Lunarians-descended from the imported stock and from the same early ancestors as ourselves, human in every detail of anatomy.

"I won’t dwell on the problems that confronted the developing Lunarian civilization-they’re well-known by now. Their history was one long story of war and hardship enacted around a racial quest to escape from their dying world. Their difficulties were compounded by a chronic shortage of minerals, possibly because the planet was naturally deficient, or possibly because it had been thoroughly exploited by the Ganymeans. At any rate, the warring factions polarized into two superpowers, and in the showdown that followed they destroyed themselves and the planet."

Hunt paused again at this point to allow another period of consolidation for the audience. This time, however, there was complete silence. Nothing he had said so far was new, but he had formed a set selected from the thousand and one theories and speculations that had raged around Navcomms for as long as many could remember. The silent watchers in the theater sensed that the real news was still to come.

"Let’s stop for a moment and examine how well this account fits in with the evidence we have. First, the original problem of Charlie’s human form. Well, that’s answered: He was human-descended from the same ancestors as the rest of us and requiring nothing as unlikely as a parallel line to explain him. Second, the absence of any signs of the Lunarians on Earth. Well, the reason is quite obvious: They never were on Earth. Third, all the attempts to reconcile the surface geography of Charlie’s world with Earth become unnecessary, since by this account they were indeed two different planets.

"So far so good, then. This by itself, however, does not explain all the facts. There are some additional pieces of evidence which must be taken into account by any theory that claims to be comprehensive. They can be summarized in the following questions:

"One: How could Charlie’s voyage from Minerva to our Moon have taken only two days?

"Two: How do we explain a weapons system, consistent with the Lunarian level of technology, that was capable of accurate registration over a range extending from our Moon to Minerva?

"Three: How could the loop feedback delay in the fire-control system have been substantially less than the minimum of twenty-six minutes that could have applied over that distance?

"Four: How could Charlie distinguish surface features of Minerva when he was standing on our Moon?"

Hunt looked out from the screen and allowed plenty of time for the audience to reflect on these questions. He stubbed out his cigarette and leaned forward toward the camera, his elbows corning to rest on the desk.

"There is, in my submission, only one explanation which is capable of satisfying these apparently nonsensical requirements. And I put it to you now. The moon that orbited Minerva from time immemorial up until the time of these events fifty thousand years ago-and the Moon that shines in the sky above Earth today-are one and the same!"

Nothing happened for about three seconds.

Then gasps of incredulity erupted from around the darkened room. People gesticulated at their neighbors while some turned imploringly for comment from the row behind. Suddenly the whole theater was a turmoil of muttered exchanges.

"Can’t be!"

"By God-he’s right!"

"Of course… of course…

"Has to be…"

"Garbage!"

On the screen Hunt stared out impassively, as if he were watching the scene. His allowance for the probable reaction was well timed. He resumed speaking just as the confusion of voices was dying away.

"We know that the moon Charlie was on was our Moon-because we found him there, because we can identify the areas of terrain he described, because we have ample evidence of a large-scale Lunarian presence there, and because we have proved that it was the scene of a violent exchange of nucleonic and nuclear weapons. But that same place must also have been the satellite of Minerva. It was only a two-day flight from the planet-Charlie says so and we’re confident we can interpret his time scale. Weapons were sited there which could pick off targets on Minerva, and observations of hits were almost instantaneous; and if all that is not enough, Charlie could stand not ten yards from where we found him and distinguish details of Minerva’s surface. These things could only be true if the place in question was within, say, half a million miles of Minerva.