Authority has banned all energy-intensive usages, to safeguard this secret of keeping the Peace. But once established, you know that a bobble is stable and requires no further inputs to maintain itself.'

'Lasting forever,' put in old Schelling. It was not quite a question.

'That's what we all thought, sir. But nothing lasts forever. Even black holes undergo quantum decay. Even normal matter must eventually do so, though on a time-scale beyond imagination. A decay analysis has not been done for confinement spheres until quite recently.' He nodded to an assistant who passed three heavy manuscripts across the table to the NM officials. Schelling scarcely concealed his eagerness as he flipped past the Peace Authority Secret seal — the highest classification a government official ever saw-and began reading.

'So, gentlemen, it appears that — like all things-bobbles do decay. The time constant depends on the sphere's radius and the mass enclosed. The Tucson blast was a tragic, fluke accident.'

'And you're telling us that every time one of the damn things goes, it's going to make a bang as bad as the bombs you're supposed to be protecting us from?'

Avery permitted himself to glare at the general. 'No, I am not. I thought my description of the Tucson incident was clear: There was an exploded nuclear weapon inside that confinement.'

'Fifty years ago, Mr. Avery, fifty years ago.'

Hamilton stepped back from the podium. 'Mr. Halberstamm, can you imagine what it's like inside a ten-meter bobble? Nothing comes in or goes out. If you explode a nuke in such a place, there is nowhere to cool off. In a matter of milliseconds, thermodynamic equilibrium is reached, but at a temperature of several million degrees. The innocent seeming bobble, buried in Tucson all these decades, contained the heart of a fireball. When the bobble decayed, the explosion was finally released.'

There was an uneasy stirring among the Strategic Studies Committee as those worthies considered the thousands of bobbles that littered North America. Geraldo Alvarez, a presidential confidant of such power that he had no formal position whatsoever, raised his hand and asked diffidently, 'How frequently does the Authority expect this to happen?'

'Dr. Schelling can describe the statistics in detail, but in principle the decay is exactly like that of other quantum processes: We can only speak of what will happen to large numbers of objects. We could go for a century or two and not have a single incident. On the other hand, it is conceivable that three or four might decay in a single year. But even for the smallest bobbles, we estimate a time constant of decay greater than ten million years.'

'So they go off like atoms with a given half-life, rather than chicken eggs hatching all at once?'

'Exactly, sir. A good analogy. And in one regard, I can be more specific and encouraging: Most bobbles do not contain nuclear explosions. And large bobbles-even if they contain 'fossil' explosions — will be harmless. For instance, we estimate the equilibrium temperature produced by a nuke inside the Vandenberg or Langley bobbles to be less than one hundred degrees. There would be some property damage around the perimeter, but nothing like in Tucson.

'And now, gentlemen, I'm going to give our side of the meeting over to Liaison Officers Rankin and Nakamura.' He nodded at his third-level people. 'In particular, you must decide with them how much public attention to give this incident. 'And it better not be much.' 'I must fly to Los Angeles. Aztlan detected the explosion, and they deserve an explanation, too.'

He gestured his top Albuquerque man, the usual Peace rep to the highest levels of the Republic, to leave with him. They walked out, ignoring the tightened lips and red faces across the table. It was necessary to keep these people in their place, and one of the best ways of doing that was to emphasize that New Mexico was just one fish among many.

Minutes later they were out of the nondescript building and on the street. Fortunately, there were no reporters. The NM press was under fair control; besides, the existence of the Strategic Studies Committee was itself a secret.

He and Brent, the chief liaison officer here, climbed into the limo, and the horses pulled them into the afternoon traffic. Since Avery's visit was unofficial, he used local vehicles, and there was no escort; he had an excellent view. The layout was similar to that of the capitol of the old United States, if you could ignore the bare mountains that jaggedly edged the sky. He could see at least a dozen other vehicles on the wide boulevard. Albuquerque was almost as busy and cosmopolitan as an Authority enclave. But that made sense: The Republic of New Mexico was one of the most powerful and populous nations on Earth.

He glanced at Brent. 'Are we clean?'

The younger man looked briefly puzzled, then said, 'Yessir. We went over the limo with those new procedures.'

'Okay. I want to take the detail reports with me, but summarize. Are Schelling and Alvarez and company as innocently surprised as they claim?'

'I'd stake the Peace on it, sir.' From the look on Brent's face, the fellow understood that was exactly what he was doing. 'They don't have anything like the equipment you warned us of. You've always supported a strong counter-intel department here. We haven't let you down; we'd know if they were anywhere near being a threat.'

'Hmm.' The assessment agreed with Avery's every intuition. The Republic government would do whatever they could get away with. But that was why he'd kept watch on them all these years: He knew they didn't have the tech power to be behind

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