One afternoon I'd opened Dennis's lunch kit to see how much he'd eaten and found the note I'd packed that morning. It said, "Please eat your whole lunch today! I love you! Daddy." On the other side, written in a childish scrawl was Dennis's reply: "I love you to. you are very specil to me. I realy think your the best. I love you very much dady I never loved eneyone more than you. I never new anyone nicer than you." At the bottom, he'd drawn three hearts and put the word «dady" in the biggest of them.

So the miracle was complete. Dennis could form a deep attachment. And he could express it. And all I had to do was sit and glow and realize that despite all my doubts and all my mistakes, I was getting the important part of the job done right. I had passed from wannabe to gonnabe to finding-how-to-be to simply be-ing. I was glowing as brightly as the warm Arizona evening. Pink clouds were striped across the darkening twilight sky.

I didn't know anyone else at the party besides Jeff and Carol — and the world-famous Mr. Byte who was in the kitchen begging scraps he wasn't supposed to have. But that was all right. I was content just to sit and watch my son enjoying himself. And then I heard the word «Martian" in back of me, and without moving, my attention swiveled 180 degrees.

Four of the wives were sitting together — it was that kind of party; the programmers were talking code, the wives were talking children. I didn't know enough about either subject, I still felt like a dabbler in both fields, so I made the best kind of listener. One of the women was saying. "No, it's true. Since she was old enough to talk she's insisted that she's a Martian. Her mother has never been able to convince her otherwise. She asked her, 'How do you explain that I remember going to the hospital and giving birth to you? and she said, 'I was implanted in your tummy. She's twelve now and she still believes it. She has a whole story, an explanation for everything. She says UFOs are implanting Martian babies all the time."

The other women laughed gently. I found myself smiling to myself and watching Dennis. Remembering for the first time in a long while what he'd once told his caseworker — that he was a Martian too. Interesting coincidence.

Then, one of the others said, "We had a boy in my daughter's school who wore a T-shirt to school almost every day that said, 'I am a Martian. He took a lot of teasing about it. The principal tried to make him stop wearing it, but he refused. All the kids thought he was crazy."

"That was probably the only way he could get the attention he needed."

"Well," said the fourth voice, "it's a common childhood fantasy — that the child is really a changeling or an orphan and that you're not her real mother. Adding Mars to it is just a way to take advantage of the information in the real world to make it more believable."

I didn't hear any more of that conversation; we were interrupted by Carol announcing that dessert was served; but a seed of inquiry had been planted. If nothing else, I thought it might make an interesting story. If only I could figure out an ending for it. Let's see, a man adopts a little boy and then discovers that the child is a Martian.

Hm. But what's the hook?

Horror story? Too easy. Too obvious — the Martian children are going to murder us in our beds. Besides, Richard Matheson could do it better, if he hadn't already. John Wyndham already had. A hidden invasion? The Martians will take us over without our ever knowing? Fred Brown had beaten me to it by four decades. His story had even ended up as an episode on Hitchcock. Maybe something tender and gentle instead? Parenting a starlost orphan? That would be the hardest to write — and Zenna Henderson had already written it several times over. Sturgeon was another one who could handle that angle. I wished I could pick up the phone and call him. He would have had the most interesting insight for the ending, but the connect charges would have been horrendous. I could call Harlan, of course, but he'd probably bitch at me for interrupting him during Jeopardy. Besides, I didn't think he would take this question seriously. "Harlan, listen — I think my son's a Martian, and I'm trying to write it up as a story…." Yeah, right, David. Have you had your medication checked recently?

I made a mental note to think about it later. Maybe my subconscious would think about it during the drive home. Maybe I'd stumble across an ending by accident. I really couldn't do anything at all without an ending in mind. It's easy to start a story, but if you don't know the ending, you don't know what you're writing toward and after a while the story goes adrift, the energy fails, and you've got one more thing to be frustrated about. I had a file cabinet full of unfinished stories to prove that this was not the best way to generate pay copy.

The next day… we were slicing across the desolate red desert, seemingly suspended between the blazing sky and the shimmering road, not talking about anything, just listening to a tape of Van Dyke Parks and sipping sodas from the cooler. The tape came to an end and the white noise of the wind rushed in to envelop us. Convertibles are fun, but they aren't quiet.

Abruptly, I remembered last night's conversation.

"Hey," I asked. "Are you a Martian?"

"What?"

"Are you a Martian?" I repeated.

"Why do you ask that?"

"Ah, obviously you're a Jewish Martian. You answer a question with a question."

"Who told you I was a Martian?"

"Kathy did. Before I met you, we had a meeting. She told me all about you. She said that you told her you were a Martian. Do you remember telling her that?"

"Yes."

"Are you still a Martian?"

"Yes," he said.

"Oh," I said. "Do you want to tell me about it?"

"Okay," he said. "I was made on Mars. I was a tadpole. Then I was brought to Earth in a UFO and implanted in my Mommy's tummy. She didn't know. Then I was borned."

"Ahh," I said. "That's how I thought it happened. Is that all?"

"Uh-huh."

"Why did the Martians send you here?"

"So I could be a Earth-boy."

"Oh."

"Can we go to Round Table Pizza for dinner?" he asked, abruptly changing the subject as if it was the most natural thing to do.

"Do Martians like pizza?"

"Yes!" he said excitedly. Then he pointed his fingers at me like a funny kind of ray gun. Most children would have pointed the top two fingers to make a pretend gun, but Dennis pointed his index and little fingers, his thumb stood straight up for the trigger. "If you don't take me out for pizza tonight, I'll have to disneygrade you."

"Ouch, that sounds painful. I definitely do not want to be disneygraded. Then I'd have to stand in the dark and sing that awful song forever while boatloads of Japanese tourists take pictures of me. But we're not going tonight. Maybe tomorrow, if you have a good day at school."

"No, tonight! " He pointed his fingers menacingly — both hands now — and for a moment I wondered what would happen if he pressed his thumbs forward. Would I be turned into a giant three-fingered mouse?

"If you disneygrade me," I said, "for sure you won't get any pizza."

"Okay," he said. Then he closed up both weapons, first one hand, then the other. First the little finger of his left hand, then the index finger; then the little finger of his right hand, then the index finger. Each time he made a soft clicking sound with his mouth. Finally he folded his thumbs down — and abruptly he had hands again.

Later, I tried to do the same thing myself. A human can do it, but it's like the Vulcan salute. It takes practice.

I have a pinched nerve in my back. If I do my twisting exercises a couple of times a week, and if I take frequent breaks from the keyboard, and if I remember to put myself into the spa every couple days and let the bubbles boil up around me, then I can keep myself functioning pretty much like a normal person. It's a fair trade. Usually I wait until after dinner to sit in the spa. After the sun sets is a perfect time for a little skinny-dipping.