"So we use what time marks we can find on the surface of Terra herself. The radioactive dating of that impact crater is probably close-but in any case, if the crater is missing, you're too early by some centuries. The dates for the building of the Great Wall of China are quite good, same for the Egyptian pyramids. The dates for the Suez Canal and the Panama Canal are exact-so, unfortunately, is the date of the destruction of Europe-but don't try to watch it! Keep your screens up and get out fast; that is a year when a strange spaceship would be shot out of the sky if you were careless enough to be vulnerable. In fact, if any time marker on this list shows that you are later than 1940 Gregorian, get out at once!-and shoot for an earlier date.
"That's enough for now; it's getting toward bedtime by my sort of time, irrelevant though it may be to anything outside this ship. I want you to study all this stuff until you can recite it in your sleep, dates and what you look for and how to find it-even if you don't have a Terra globe to look at. Anybody think she can beat me at crib? Don't all speak at once."
"I can," said Dora, "if you promise not to cheat on the shuffle."
"Later, Dora," said Captain Lorelei. "Now we tell him." "Oh! All right, I'll be very quiet."
"Tell me what?" demanded Lazarus.
"That it's time for you to impregnate us, Lazarus."
"Both of us," agreed Lapis Lazuli.
Lazarus counted ten chimpanzees in his mind-then ten more. "Absolutely out of the question!"
They glanced at each other. Lorelei said:
"We knew you would say that-"
"-but the only question is whether you do it sweet and friendly like-"
"-or we tell Ish you said No and she does it for us-your sperm-from the sperm bank-"
"-but we'd be much happier if our beloved brother, who has always been good to us-"
"-but is now going to go get his ass shot off in the Dark Ages-"
"-were to drop his silly prejudices just once-"
"-and treat us as biologically mature females-"
"-instead of the children we used to be-"
"-Ira and Galahad and Justin don't treat us as children-"
"-but you do and it's not just humiliating; it's downright heartbreaking when we may never see you again-"
"-when you didn't make any real fuss about knocking up Minerva-"
"-not to mention Tammy and Hamadarling and Ish-"
"Stop it!"
They stopped.
"I concede a remote possibility with respect to three of them, although mathematically most unlikely."
Lorelei said quietly, "Mathematically extremely likely, Lazarus, because we were all in on it. Justin and Ira and Galahad hung back at the right times just the way they insured that Minerva's first baby was Ira's and Tammy's first was Justin's. But if it did not work out-for any one of four, not 'three'-then Ishtar will correct it from the sperm bank."
"I'm not in the sperm bank!"
The girls exchanged glances. Lapis Lazuli said, "Want to bet?"
The computer said, "It's a sucker bet, Buddy."
Lazarus looked thoughtful. "Unless Ishtar tricked me almost twenty years back. When I was her rejuve client."
Lorelei said quietly, "I suppose she could have, Lazarus. But she did not, that I know of-and this is fresh sperm. Frozen not more than a year ago, any of it. After the day you announced a date for this trip."
"Impossible."
"Better not say 'Impossible.' What is the perfect container for keeping sperm fresh and alive until a technician can bank it?"
Lazarus looked very thoughtful. "Well...I'll...be damned!"
"Correct, Brother. Place a woman around it. You were being oh so careful to pick your bedmates by their cycles so that you wouldn't leave any babies behind; and they were being oh so careful to see Ish or Galahad as soon as you fell asleep...as well as fudging calendars, too. The point is, beloved brother of ours, you don't own your genes-nobody does. We've heard you say so, in discussing how Minerva was constructed. Genes belong to the race; they're simply lent to the individual for his-her lifetime. And all of us-knowing you were going to try this reckless thing-decided that, while you were free to throw away your life, you weren't free to waste a unique gene pattern."
Lazarus changed the subject. "Why do you say 'four'?'
Lorelei answered, "Brother, are you ashamed of Minerva? I do not believe it. Nor does Laz"
"Uh- No, I'm not ashamed of her, I'm proud of her! Damn it, you two have always been able to get me mixed up. I simply did not know that she had told anyone. I have not."
The other twin said, "Who would she turn to but us?"
"You mean 'To whom would she turn.'"
"Damn it, Brother, this is a hell of a time to be correcting our grammar! Minerva turned to us for advice-and comfort!
-because we're in the same difficult position with respect to you that she is. That she was, I mean, for she came out of the bushes looking as smug as a cat. You made her happy-"
"-when she had been crying her eyes out-"
"-and she'll stay happy now, even if she missed catching-"
"-because once is enough for a symbol and if she missed-"
"Ish will fix it-"
"-and of course we knew about it when you finally quit dithering and did what you should have done for her years ago-"
"-because we helped rig it so that she could get you alone and twist your arm-"
"-and told her that if tears weren't enough, to chuck in some chin quivering-"
"-and it worked and she's happy-"
"-but we're not so damned happy, not at all, but we won't cry at you-"
"-or quiver our chins; that's childish. If you won't do it simply because you love us-"
"-then the hell with it and we probably won't even fall back on the sperm bank. Instead-"
"-it might be better to have Ish sterilize us-"
"-permanently-not just offset fertility temporarily-"
"-and quit being females, since we're failures at it-"
"STOP IT! If you're not going to cry at me, what are all those tears for?"
Lapis Lazuli said with quiet dignity, "Those aren't weeping tears, Brother; they come from sheer exasperation. Come on, Lor; we've swung and we've missed-let's go to bed."
"Coming, Sister."
"If the Commodore will excuse us?"
"He damn well won't! Sit back down. Girls, can we talk about this quietly without you two whipsawing me?"
The two young women sat back down. Captain Lorelei glanced at her sister and said, "Laz agrees that I will speak for us both. No whipsawing."
Lazarus said thoughtfully, "Do you two run your brains in tandem or in parallel?"
"I do not think that is relevant to the discussion."
'Just scientific interest. If you could teach me how to do it, we three might make quite a team."
"That can be only conjectural, Lazarus...since you reject us."
"Damn it, girls-I have not rejected you, I will never reject you."
They said nothing; he went on, uncomfortably: "There are two aspects to this; one is genetic, the other is emotional. Genetic- We three are a weird case; male and female, yet quasi-identicals. More than quasi-forty-five forty-sixths to be exact. Which makes the probability of bad reinforcement far greater than it is for ordinary siblings. - But besides that, we are Howards only by courtesy, as our genes have not undergone some twenty-four centuries of systematic culling. I'm so close to the head of the column that there was no culling at all; my four grandparents were among the first selectees, so when I was born in Gregorian 1912, I had behind me no inbreeding, no culling out, no cleaning of the gene pool. And you dears are in the same predicament as even that forty-sixth chromosome comes from me, since it replicates my forty-fifth. Yet you two seem willing to accept this high risk of reinforcement."