"Daddy, are there any aliens?"
"We don't know. There may be aliens, and again, there may be none."
"Daddy, what do aliens look like?"
"I don't know. Nobody knows. There may be no aliens. But you know why there is a chance that aliens exist?"
"Because there are so many stars in the sky. And many of the stars may have planets, like the earth is a planet. That's why aliens are sometimes called extraterrestrians. Because we are terrestrians."
"I'm not a terrestrian."
"Yes, you are. Terrestrians are the people who live on Earth. Terra means Earth in Latin. Latin was the language the Romans spoke many years ago. If there are aliens out there, you know what they might do?"
"No, Daddy, tell me."
"They might send us messages. Through the airwaves. Like we send music and pictures through the air."
"No, through the air. There are things, like forces, that are invisible and go through the air. When you have a magnet, and a piece of iron underneath, what happens?"
"It jumps up."
"Right, it jumps up. But it jumps because the piece of iron is attracted by the magnet through the air."
"What about the fridge?"
"The fridge is attracted, too. But it doesn't jump because it's too big."
"Like Piglet sent a message, too."
"Piglet. He sent a message in a bottle. Help Me, it said."
"Oh, in the Winnie-the-Pooh book. Piglet was surrounded by water in the flood, and he did something clever: he sent a message in a bottle to get help. But he didn't say where he lived, and that was the stupid part."
"He wrote down Help Me, and didn't say where he lived, and that was real stupid."
"Anyway, if there are any aliens, then some of them may be very clever, and they have figured out how to send us messages through the air. That's why there are people who have put up some listening devices to listen to the sky. If the aliens have to tell us something, then we could pick it up. But so far, nothing has been happening."
"You mean, there are no aliens?"
"Perhaps there are. We just don't know."