"Sure," the captain said. "Anyhow, I'm going to leave some men on. It seems the birds don't stop all murders."
"Why not?"
"Some murderers don't have these brain waves," the captain answered, trying to remember what the newspaper article had said. "Or their glands don't work or something."
"Which ones don't they stop?" Celtrics asked, with professional curiosity.
"I don't know. But I hear they got the damned things fixed so they're going to stop all of them soon."
"How they working that?"
"They learn. The watchbirds, I mean. Just like people."
"You kidding me?"
"Nope."
"Well," Celtrics said, "I think I'll just keep old Betsy oiled, just in case. You can't trust these scientists."