Half a year later, we had a child.
During that time, the only interruption to this plain but busy life was a visit from an American. He introduced himself as Norton Parker, an astronomer, and said I ought to recognize him. When he mentioned the SETI@home project, it came to me at once: he had been in charge of the project to search for extraterrestrial intelligence whose distributed processing server Lin Yun and I had invaded to swap in the mathematical model for ball lightning. That experience seemed a world away. Now that the early research on ball lightning was known to the world, it would not have been hard for him to find me.
“There was also a woman involved, I believe.”
“She’s no longer on this earth.”
“Dead in the war?”
“…You could say that.”
“Damn the war…. I came to tell you about an applied ball lightning project I’m heading up.”
With the secret of ball lightning now unlocked, collecting macro-electrons and exciting them into ball lightning had become an industrialized operation, and research on civil applications was making swift progress. It had many unbelievable uses, including burning away cancer cells in sick patients without harming other organs. But Parker said his project was more surreal.
“We’re searching for and observing a particular phenomenon of ball lightning: sometimes it maintains a collapsed state, not a quantum state, even without an observer.”
I was unimpressed. “We encountered that a number of times, but ultimately we were able to find one or several undetected observers. The one I remember most clearly was on a target range. We later learned that the observer was a reconnaissance satellite in space that had caused the ball lightning to collapse.”
Parker said, “And that’s why we chose to conduct tests in places where all observers could absolutely be screened out. Places like abandoned deep mines. We removed all personnel and observation equipment, so there shouldn’t have been any observers inside. We set the accelerators to automatic, conducted target tests, and then used the hit rate to ascertain whether or not the ball lightning was in a collapsed state.”
“And the results showed…?”
“We have performed tests in thirty-five mines. The outcome of the majority of them was normal. But on two occasions, the ball lightning reached a collapsed state in the mine without any observer.”
“So do you think that the outcome raises doubts about quantum mechanics?”
Parker laughed. “No, quantum mechanics isn’t wrong. But you’ve forgotten my specialty. We’re using ball lightning to search for aliens.”
“What?”
“In the mine tests, there were no human observers, and no man-made observation equipment, but the ball lightning remained collapsed. This can only mean that there was another, nonhuman, observer.”
This immediately piqued my interest. “It would have to be a very powerful observer to see through the earth’s crust!”
“That’s the only reasonable explanation.”
“Can those two tests be repeated?”
“Not anymore. But the collapsed-state outcome of the tests remained for three full days before the tests started producing quantum-state outcomes again.”
“There’s an explanation for that, too: the super-observer must have detected that you had detected it.”
“Perhaps. So we’re planning even larger-scale tests now, to find more of this phenomenon for study.”
“That’s significant research indeed, Dr. Parker. If you are really able to prove that a super-observer is watching our world, then human activity becomes very indiscreet…. You could say human society is in a quantum state, and a super-observer will force it to collapse to a state of reason again.”
“If we’d found that super-observer a little earlier, maybe war could have been averted.”
Parker’s research prompted me to pay a visit to Ding Yi. To my surprise, he was living with a lover, a dancer who had lost her job in the war. She was clearly a simpleminded type, and I couldn’t say how they ended up together. Evidently Ding Yi had learned how to enjoy life apart from physics. A person like him wouldn’t bother with marriage, of course, but fortunately the woman wasn’t looking for that, either.
When I arrived, Ding Yi wasn’t at home, just the woman. His three-bedroom apartment wasn’t as spare as it was before: to his calculation papers, she had added lots of cute decorations.
The moment the woman heard I was Ding Yi’s friend, she asked me whether he had any other lovers.
“Physics counts as one, I guess. No one can hold the top place in his heart so long as physics is there,” I said frankly.
“I don’t care about physics. I mean, does he have any other women?”
“I don’t think so. He’s got so much stuff in his head I don’t think he could make room for two people.”
“But I heard that during the war, he and a young major were close.”
“Oh, they were just colleagues and friends. Besides, that major isn’t here anymore.”
“I know that. But you know what? He looks at that major’s photograph every day, and rubs it.”
I had been distracted, but this surprised me. “A photo of Lin Yun?”
“Oh, so she’s called Lin Yun. She looks like a teacher, or something. Are there teachers in the army?”
This shocked me even further, and I insisted on seeing the photo. She led me to the study, opened up a drawer in a bookshelf, and took out an exquisite silver-inlaid picture frame. Then, she said, “It’s this one. Every night before he goes to sleep he steals a look at it and dusts it off. Once I told him, ‘Put it on the writing desk, I don’t mind,’ but he still doesn’t leave it out. He just gives it a stealthy look and dusts it off.”
I took the frame and held it facedown in my hand. With eyes half-closed, I steadied my heart—the woman must have been looking at me in amazement—and then I jerked the photo around and stared at it.
At once I understood why the woman had thought Lin Yun was a teacher: she was with a group of students.
She was standing in their midst, more beautiful than ever, still wearing that trim major’s uniform, with a beaming smile on her face. Looking at the children around her, I immediately recognized them as the group that had been incinerated by ball lightning at the nuclear power plant. They, too, were smiling sweetly, and were obviously very happy. I noticed in particular a little girl that Lin Yun was holding tightly, an adorable child smiling so hard her eyes were slits.
But what caught my attention was the girl’s left hand.
It was missing.
Lin Yun and the children were standing on a well-manicured lawn where there were a few small white animals. Behind them, I could see a familiar structure: the macro-electron excitation lab, where we had heard the bleat of a quantum goat. But in the photograph, the warehouse’s long exterior wall was painted in colorful cartoon animals, flowers, and balloons. The brilliant colors made the building look like an enormous toy.
From the photograph, Lin Yun looked at me with her touching smile, and in her limpid eyes I read things I had not seen while she was alive: a happy belonging and a peace from somewhere deep within. It reminded me of a distant, long-forgotten still harbor in which a small boat was moored.
I gently returned the photo to the drawer and walked out to the balcony, unwilling to let Ding Yi’s lover see the tears in my eyes.
Ding Yi never spoke of the photo. He never even mentioned Lin Yun, and I never asked. It was a secret deep in his heart.