Earthfall Page 0,94

here on the ship-we should be making reports every night,"

"When do we do all this?" asked Oykib.

"The work with the diggers starts immediately," said Volemak. "But until we can take a healthy-or at least not dying-angel back up to his people, we aren't going back up that canyon. So for now, the four of you will take shifts with this poor busted-up fellow. Spend as much time with him as Shedemei thinks advisable. Make a friend out of him, if you can." Then he glowered at them all. "And you will make sure that you never take this fellow anywhere that he even might run into Elemak. Elya will have access to the ship as always, but I'll ask him to stay off the deck where Shedemei is helping the angel recuperate. That should do the job."

Shedemei had only one thing to add. "I especially want to know anything that has to do with sex. Reproduction and survival-those are the two key forces that drive evolution. I won't understand their biology or their culture until I know what is imperative for their mating, breeding, sustenance, and defense. Somehow those sculptures play a role for both cultures."

"Art is life," Nafai intoned. "And life is art."

Luet poked him again, as hard as she could. He yelped. She hoped it left a bruise.

As the meeting broke up, Shedemei and Issib spent a few moments looking in detail at the scans and charts of the digger and angel bodies. "I was going to bring this up for the whole group," Shedemei said, "but the meeting went a different way. I didn't know what Volemak was planning, and all that matters is that you be aware of this so you can watch for an explanation when you're up the canyon with the angels."

"I haven't agreed to go," said Issib.

Shedemei looked at him blankly.

"Yes, well, show me anyway," said Issib.

"Here," she said, "In the digger males. And here, in our one angel, also a male."

"I don't know what it is you're pointing at."

"Neither do I," said Shedemei. "But it's a tiny organ, maybe a gland, I'm not sure at all of the function. But it isn't present in humans, and it isn't present in any other species I've scanned."

"So, they're different."

"It's not that simple," said Shedemei. "Biological diversity come through branching. There are two ways that creatures can have similar organs. One is that they have a common ancestor. The other is through convergent evolution-similar pressures in the environment caused them to develop similar strategies to counter it. Now, if they have the identical organ because of a common ancestor, there should be evidence of it in all the other species that diverged from the same source at the same time. But there isn't, Issib. No other species of rat or bat or any other rodent or related animal has anything remotely like this structure in this location or even near it, I'm talking about now and I'm talking about forty million years ago, when the oldest biological database on the ship was put together. It's not there."

"Convergent evolution, then."

"But except in the case of skeletal and muscular structure, convergent evolution only gets you organs with similar functions. There's no particular reason why they should have the same location."

"Unless it has to do with male reproduction and just above the scrotum is the only location that would work," said Issib.

"Exactly. So what I need you to look for, and what I'll be looking for down here, is a reason for these two species, and only these two species, to have this organ. When you think about it, why should the two sentient species on Earth have this particular similarity?"

"Because it's related to their intelligence?" asked Issib.

"That has to be the first thought," said Shedemei. "But then, we haven't had a chance to look at females. They're intelligent, too-but if they lack this structure-"

"Or one that has an analogous function-"

"You see the mystery," said Shedemei. "This organ came from somewhere and has some function, and it exists only in the two intelligent species, and may exist only in the males. It may have to do with intelligence. It may have to do with sex, given the location."

Issib grinned. "Maybe they're more similar to humans than we thought."

Shedemei glowered. "You mean that maybe male intelligence is testosterone-related?"

"I would have put it more crudely," said Issib.

"No doubt," said Shedemei, "seeing as you're a male. But as you implied, human males already think with their male appendage half the time,