"Father," said Libo.

Only then did Pipo notice that he had stopped ten meters away from the station. Tangents. The best parts of my intellectual life are tangential, in areas outside my expertise. I suppose because within my area of expertise the regulations they have placed upon me make it impossible to know or understand anything. The science of xenology insists on more mysteries than Mother Church.

His handprint was enough to unlock the door. Pipo knew how the evening would unfold even as he stepped inside to begin. It would take several hours of work at the terminals for them both to report what they had done during today's encounter. Pipo would then read over Libo's notes, and Libo would read Pipo's, and when they were satisfied, Pipo would write up a brief summary and then let the computers take it from there, filing the notes and also transmitting them instantly, by ansible, to the xenologers in the rest of the Hundred Worlds. More than a thousand scientists whose whole career is studying the one alien race we know, and except for what little the satellites can discover about this arboreal species, all the information my colleagues have is what Libo and I send them. This is definitely minimal intervention.

But when Pipo got inside the station, he saw at once that it would not be an evening of steady but relaxing work. Dona Cristã was there, dressed in her monastic robes. Was it one of the younger children, in trouble at school?

"No, no," said Dona Cristã . "All your children are doing very well, except this one, who I think is far too young to be out of school and working here, even as an apprentice. "

Libo said nothing. A wise decision, thought Pipo. Dona Cristã was a brilliant and engaging, perhaps even beautiful, young woman, but she was first and foremost a monk of the Order of the Filhos da Mente de Cristo, Children of the Mind of Christ, and she was not beautiful to behold when she was angry at ignorance and stupidity. It was amazing the number of quite intelligent people whose ignorance and stupidity had melted somewhat in the fire of her scorn. Silence, Libo, it's a policy that will do you good.