“ I asked you earlier if you’d sterilized anyone else in the other world, and you yelled at me.”

  Ponter said nothing.

  “ Do you know why you yelled?”

  A long, shuddering sigh escaped from Ponter’s mouth. “I only sterilized the actual perpetrator, not his relatives. You know, I’d never given much thought to the…the righteousness of sterilizing innocents just to improve the gene pool. But…but Hak and I have been working through this Gliksin Bible. In the very first story, all the off spring of the original two humans were cursed because those original humans committed a crime. And that seemed so wrong, so unfair.”

  “ And as much as you wanted the Gliksin gene pool to be purged of Ruskin’s evil, you couldn’t bring yourself to track down his close relatives,” said Selgan. “For if you did, you’d be admitting that your close relatives—your two daughters—deserved to be punished for the crime you had committed.”

  “ They are innocent,” said Ponter. “No matter how wrong what I did was, they do not deserve to suffer for it.”

  “ And yet they will if you come forward and admit your crime.”

  Ponter nodded.

  “ And so what do you intend to do?”

  Ponter lifted his massive shoulders. “Carry this secret with me until I die.”

  “ And then?”

  “ I—I beg your pardon?”

  “ After you are dead, then what?”

  “ Then…then nothing.”

  “ Are you sure of that?”

  “ Of course. I mean, yes, I have been studying this Bible, and I know Mare is sane and intelligent and not delusional, but…”

  “ You have no doubt that she is wrong? No doubt that there is nothing after death?”

  “ Well….”

  “ Yes?”

  “ No. Forget it.”

  Selgan frowned, deciding it wasn’t yet quite time to press this point. “Have you wondered about why Mare is attracted to you?”

  Ponter looked away.

  “ I heard what you said earlier about them also being humans. But, still, you are less like her than any other human she had ever met to that point.”

  “ Physically, perhaps,” said Ponter. “But mentally, emotionally, we have much in common.”

  “ Still,” said Selgan, “since Mare had been hurt by a male of her own species, she might—”

  “ Don’t you think that’s already occurred to me?” snapped Ponter.

  “ Speak it aloud, Ponter. Get it out in the open.”

  Ponter snorted. “She might be attracted to me because in her eyes I am not human—not one of those who hurt her.”

  Selgan was quiet for a few beats. “It’s a thought worth reflecting on.”

  “ It doesn’t matter,” said Ponter. “It doesn’t matter one bit. I love her. And she loves me. Nothing besides those two facts is important.”

  “ Very well,” said Selgan. “Very well.” He paused again, and let his tone sound absent, as if an odd thought had just occurred to him, rather than that he’d been waiting for the right moment to present this. “And, say, have you given any thought as to why you are attracted to her?”

  Ponter rolled his eyes. “Personality sculptors!” he said. “You’re about to tell me that she reminds me of Klast in some way. But you couldn’t be more wrong. She doesn’t look anything like Klast. Her personality is completely different. Mare and Klast have nothing in common.”

  “ I’m sure you’re right,” said Selgan, gesturing with his hand as if to dismiss the notion. “I mean, how could they? They aren’t even members of the same species…”

  “ That’s right,” said Ponter, folding his arms across his chest.

  “ And they come from completely different belief systems.”

  “ Exactly.”

  Selgan shook his head. “Such a bizarre notion, isn’t it? This idea of a life after death…”

  Ponter said nothing.

  “ Do you ever contemplate it? Ever wonder if, just maybe…” Selgan trailed off and waited patiently for Ponter to fill the void.

  “ Well,” said Ponter at last, “it is an appealing concept. Ever since Mare first told me of it, I’ve been thinking about it.” Ponter raised his hands. “I mean, sure, sure, I know that there is no afterlife—at least not for me. But…”

  “ But she lives in an alternative physical plane,” supplied Selgan. “Another universe. A universe where things might be different.”

  Ponter’s head moved vertically in the slightest of nods.

  “ And she isn’t even Barast, is she? She belongs to another species. Just because we don’t have these—what do they call them? These immortal souls? Just because we don’t have immortal souls, doesn’t mean that they don’t, does it?”

  “ Do you have a point?” snapped Ponter.

  “ Always,” said Selgan. “You lost your own woman-mate twenty-odd months ago.” He paused, and made his voice as soft as he could. “Mare is not the only one recovering from a trauma.”

  Ponter lifted his eyebrow. “Granted. But I hardly see how Klast’s death would propel me into the arms of a woman from another world.”

  There was silence for an extended time. Finally, Hak, who had been quiet all through the therapy to this point, addressed Selgan through his external speaker. “Do you want me to tell him?”

  “ I’ll do it,” said Selgan. “Ponter, please take this gently, but…well, you have told me of Gliksin beliefs.”

  “ What about them?” said Ponter, an edge still in his voice.

  “ They believe the dead are not really dead. They believe that the consciousness of the individual lives on after the body.”

  “ So?”

  “ So maybe you’re looking to insulate yourself from the same kind of pain that you suffered when Klast died. If your woman-mate believed in this…this immortality of the mind, or if you thought, however irrationally, that she might actually have such immortality, then…” Selgan trailed off, inviting Ponter to finish the thought for him.

  Ponter sighed, then did so. “Then if the unthinkable were to happen, and I were to lose my woman-mate again, I might not be so devastated, since she might not really be totally gone.”

  Selgan lifted his eyebrow and both shoulders slightly. “Exactly.”

  Ponter rose to his feet. “Thank you for your time, Scholar Selgan. Healthy day.”

  “ I’m not sure we’re finished yet,” said Selgan. “Where are you going?”

  “ To do something I should have done long ago,” said Ponter, marching out of the circular room.

  Louise Benoît came into Jock Krieger’s office at the Synergy Group. Jock didn’t have any geologists on staff, but Louise was a physicist, and she’d spent all that time working down at the bottom of the Creighton Mine, so he’d assigned this task to her.

  “Okay,” she said. “I’ve worked it out, I think.” She spread two large charts on the worktable in Jock’s office. Jock got up from behind his desk and joined Louise at the table.

  “This one,” she said, pointing a red-painted fingernail at the chart on the left, “is a standard paleomagnetic chronology made by our people.”

  Jock nodded.

  “And this one”—she indicated the other chart, which was filled with strange symbols—“is the comparable chart we got from the Neanderthals.”

  Even though Mary Vaughan had found no evidence that the Neanderthal magnetic field really had reversed, Jock had used his clout to make the swapping of paleomagnetic information a top priority. If the Neanderthals were wrong about the magnetic field collapsing rapidly, well, then Jock would know he was worrying for nothing. But he wanted to be sure.

  “Okay,” said Louise. “As you can see, we’ve mapped a lot more geomagnetic reversals than they have—over 300 in the last 175 million years. That’s because there’s a more complete record in sea-floor rocks than there is in meteorite finds.”

  “Score one for our side,” said Jock, dryly.

  “So,” continued Louise, ??
?what I’ve done is pair up the reversals that do match—that is, the ones that both they and we have evidence for. As you can see, although their record has many holes in it, there’s a one-to-one correspondence almost all the way to the present.”

  Jock looked at the sheets, Louise’s finger guiding his eyes. “Okay.”

  “Well,” said Louise, “that makes perfect sense, of course. You know my theory: that there was only one long-term universe until consciousness dawned forty thousand years ago.”

  Jock nodded. Although quantum-mechanical events caused countless brief splittings of the universe, and probably had since the beginning of time, those splittings made no macroscopic difference, and so the resulting universes had always collapsed back together after a nanosecond or two.

  But the acts of conscious beings caused splits that could not be healed, and so, when the Great Leap Forward took place forty thousand years ago—when consciousness emerged—the first ever permanent split occurred. In one universe, Homo sapiens acquired that initial consciousness; in the other, Homo neanderthalensis did—and they had been diverging ever since.

  “But wait a minute,” said Jock, peering at the Neanderthal chart. “If that one there is the last recorded magnetic reversal that we know about—”

  “It is,” said Louise. “They’ve got it listed as about ten million months ago, which is 780,000 years ago.”

  “Okay,” said Jock. “But if that’s the most recent one on our chart, what’s this one here?” He pointed to what was apparently another, more-recent reversal indicated on the Neanderthal chart. “Is that the one they said began twenty-five years ago?”

  “No,” said Louise. She had too much of the academic in her for Jock’s taste. She was clearly leading him to make his own discovery, but she obviously already knew the answer herself. He wished she’d just tell him.

  “Then when was that one?”

  “Half a million months ago,” said Louise.

  Jock made no effort to hide his irritation. “Which is?”

  Louise’s full lips spread into a grin. “Forty thousand years ago.”

  “Forty thou—! But that’s when…”

  “Exactly,” said Louise, pleased with her pupil. “That’s when the Great Leap Forward occurred, when consciousnessemerged, when the universe split apart for good.”

  “But…but how is it that they know about a magnetic reversal then and we don’t?”

  “Remember what I said the first time we were talking about this? After the magnetic field dies away, it’s a fifty-fifty chance as to what polarity the new field will come up with. Half the time, it’ll be normal, and—”

  “And half the time it will be reversed! So this event must have happened after the universes split—and since the universes were no longer in lockstep, it happened that the polarity came up reversed in the Neanderthal world—”

  Louise nodded. “Leaving a record in meteorites.”

  “But in our world, it came up with the same polarity it had had before the collapse—leaving no record.”

  “ Oui.”

  “Fascinating,” said Jock. “But wait—wait! They had a reversal forty thousand years ago, right? But Mary says that when she took a compass reading in the Neanderthal world, it now has the same polarity as our world does, so…”

  Louise nodded encouragingly; he was on the right track.

  “…so,” continued Jock, “there was a recent, rapid field collapse in the Neanderthal world, and this time, when the field came up again, just six years ago, it had flipped its polarity once more, back to matching what it is on this Earth.”

  “Exactly.”

  “All right then,” said Jock. “Well, that’s what I wanted to know.”

  “But there’s more to it than that,” said Louise. “Much more.”

  “Spit it out, girl!”

  “Okay, okay. It’s like this. Earth—the one and only Earth that existed at that time—experienced a magnetic-field collapse forty thousand years ago. While the magnetic field was down, consciousness emerged—and I can’t think that that’s a coincidence.”

  “You mean the collapsing of the magnetic field had something to do with why we developed art?”

  “And culture. And language. And symbolic logic. And religion. Yes.”

  “But how?”

  “I don’t know,” said Louise. “But remember, anatomically modern Homo sapiens have existed since one hundred thousand years ago, but they didn’t get consciousness until forty thousand years ago. We had the same physical brains for sixty thousand years without ever making art or exhibiting any of the other signs of true sentience. Then— click! —something happened, and we were conscious.”

  “Yes,” said Jock.

  “You know some birds use magnetite in their brains to tell direction?”

  Jock nodded.

  “Well, we— Homo sapiens —have magnetite in our brains, too. No one knows why, since we obviously aren’t using it as a built-in compass. But when the magnetic field collapsed forty thousand years ago, I think something happened to the magnetite that caused the—the ‘booting up,’ shall we say, of consciousness.”

  “So what’s going to happen when the magnetic field collapses again?”

  “Well, on the Neanderthal world, nothing happened during their most recent collapse,” said Louise. “But…”

  “But?”

  “But they don’t use fossil fuels. They don’t have billions of cars. They don’t use chlorofluorocarbons for air-conditioning.”

  “Yes? So?”

  “So their atmosphere—and their ozone layer—is completely intact. Ours isn’t.”

  “What’s that got to do with magnetic reversals?”

  “Earth has two methods for shielding its surface from solar and interstellar radiation: the atmosphere, and the magnetic field. If one goes down, the other covers for it…”

  Jock’s eyes went wide. “But one of ours is already down.”

  “Exactly. Our ozone layer is depleted; our atmosphere is chemically altered. When the magnetic field collapses again—and it looks like it’s starting to do that right now—there’s not going to be any backup shielding in place.”

  “What’s going to happen?”

  “ Je ne sais pas,” said Louise. “We’ll have to do a lot more modeling before we’re sure. But…”

  “Again with the buts! What? What?”

  “Well, consciousness booted up during a field collapse—and this is going to be the mother of all field collapses, as far as its effects are concerned. This time, consciousness might…well, not to stretch the metaphor too much, but this time consciousness might crash.”

  Epilogue

  Ponter thanked the travel-cube operator, and disembarked. He could feel the eyes of females on him, feel their disapproving stares. But even though it was only another day until Two next became One, this couldn’t wait.

  After most of a month back on her version of Earth, Ponter and Mary had returned to the Neanderthal world three days earlier. He’d said the timing would allow him to see both Adikor and his children on the same trip, which was certainly true. But, since Mary had to go back to staying with Lurt until Two became One, it also let him see a personality sculptor, in hopes of ridding himself of the insomnia and bad dreams that had been plaguing him.

  But now Ponter was approaching Lurt’s lab—guided by Hak; Ponter himself had never been there before. Entering the all-stone building, he asked the first woman he saw to direct him to where Mare Vaughan was working. The astonished woman—a 146—pointed, and Ponter marched down the corridor. He walked into the room that had been indicated, and saw Mary and Lurt huddled over a worktable.

  This is it, thought Ponter. He inhaled deeply, and—

  “Ponter!” said Mary, looking up. She was delighted to see him, but—

  But, no. This was his world—and it wasn’t the right time. She tried to keep her tone calm. “What’s wrong?”

  Ponter looked at Lurt. “I need to speak to Mare
alone,” he said.

  Lurt’s eyebrow went up. She squeezed Mary’s forearm, then left the room, closing the door behind her.

  “What is it?” asked Mary. She could feel her heart pounding. “Are you okay? Has something happened to Jasmel or—”

  “No. Everyone is fine.”

  Still nervous, Mary tried to make light of things. “You shouldn’t be here, you know. Two aren’t One right now.”

  But Ponter had an edge in his tone. “To…to hell with that,” he said.

  “Ponter, what is it?”

  Ponter took a deep breath, then said some words to her in his language. For the first time ever, the words were not immediately translated, and Mary saw Ponter tilt his head in the way that meant he was listening to Hak over his cochlear implants.

  Ponter spoke again, sharply, and Mary heard the Neanderthal word“ ka,” which she knew meant “yes.” Perhaps Hak had said, “Are you sure you really want to say that?” If he had, Ponter must have told him that yes, he did, and perhaps had admonished the Companion for interfering. There was silence for a couple of seconds, then Ponter opened his mouth again, but apparently that was enough of a cue for Hak to finally issue the English equivalent of Ponter’s earlier utterance. “I love you,” said the machine-synthesized voice.

  How Mary had longed to hear those words! “I love you, too,” she said. “I love you so much.”

  “We should build a life together, you and I,” said Ponter. “If—if you will have me, that is.”

  “Yes, yes, of course!” said Mary. But then her spirits began to sag. “But…but it would be complex, making such a relationship work. I mean, you have a life here, and I have a life there. You have Adikor and Jasmel and Megameg, and I have…” She paused. She’d been about to say “no one,” but if only that were true. She did have a husband, estranged to be sure, but still her lawfully wedded spouse. And, sweet Jesus, she thought, if God disapproved of divorce, what would he make of a relationship across species lines?

  “I want to try,” said Ponter. “I want to try to make this work.”

  Mary smiled. “Me too.” But then she felt her smile fade. “Still, there’s so much to consider. Where would we live? What about Adikor? What about—”