often enough to make it flash. So they built it into a smaller unit and tried it out in a few police stations. I think they tried one upstate. But it didn't work so good. You couldn't get to the crime in time. That's why they built the watchbirds." "I don't think they'll stop no criminals," one of the policemen insisted. "They sure will. I read the test results. They can smell him out before he commits a crime. And when they reach him, they give him a powerful shock or something. It'll stop him." "You closing up Homicide, Captain?" Celtrics asked. "Nope," the captain said. "I'm leaving a skeleton crew in until we see how these birds do." "Hah," Celtrics said. "Skeleton crew. That's funny." "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." "Right." "Birds!" Celtrics scoffed. Over the town, the watchbird soared in a long, lazy curve. Its aluminum hide glistened in the morning sun, and dots of light danced on its stiff wings. Silently it flew.