Leo was nine, and he had a plan for the science fair. He and his friend Nora would build the best marble run in the world. They'd spent the afternoon in the living room, among cardboard tubes and yogurt cups.
Peanut, the dog, watched the marbles, in case any were snacks. “It needs a loop!” Nora said. “So the marble goes all the way around.” And she drew a giant circle on a sheet of paper.
Leo didn't even look: the ramp had fallen down three times. “That's silly,” he snapped. “It's never going to work.” Nora folded her drawing without a word.
She put on her yellow raincoat and went home. The living room went quiet. Even Peanut stopped wagging his tail. Leo felt something strange in his tummy, like a marble stuck in a tube.
“You messed up,” said Chloe, his little sister, munching a cookie. “I know,” Leo grumbled. “But I don't know how to fix it.” Chloe had the answer: a giant card, with glitter and thirty hearts.
“That way you don't have to say anything,” she explained, very serious. Peanut had another answer: he crawled under the couch and stayed there. Both ideas were bad. Although Peanut's was tempting.
Then he spotted Nora's drawing, left behind next to the tape. He unfolded it. The loop was drawn with arrows, measurements and a smiling marble. Nora had really thought it through.
Leo cut up a bottle, bent a strip of cardboard and glued it. The first marble fell off. So did the second. “See?” Leo muttered. “It's sil…”
And he stopped, because that word had already done enough damage. He raised the ramp a little, for more speed. The marble rolled down, went all the way around and landed in a cup.
Chloe clapped. Peanut poked his nose out, just in case.
In the morning, Leo waited for Nora at the school gate. It was hard to start. The words felt heavier than the box. “I'm sorry for what I said,” he finally blurted. “Your idea wasn't silly. It was the best.”
Nora looked at him for a moment, and then she smiled. She took out a blue marble with a star inside and dropped it in. It went all the way around, and half the playground shouted, “Again!”
That night, Leo went to bed with a calm tummy, no marbles stuck. Peanut curled up at his feet, and the moon shone on the marble run. Goodnight, Leo…
