"Would you like to swap?"
I looked up as a shadow fell upon me. I shielded my eyes against the bright sun and squinted. The voice belonged to a boy, about my age, I guess. He was a serious-looking kid, with a t-shirt that read "Don't Look!" He was holding a bag in one hand and, in the other, a small rock. I blinked.
"You want to swap this toy car with that rock?"
The kid nodded.
"Yeah. Your toy looks kinda cool. Almost as good as my rock."
I blinked again. I wasn't sure if he was trying to be funny, or perhaps he was just odd.
"No thanks," I said. I gestured around me at the various pebbles and bits of stone around me. "There are loads of rocks here, already."
The boy shook his head and sat down next to me.
"Not like this," he said. "This bit of rock came from space. It used to belong to an asteroid or something. It landed in my back garden."
...
