Once upon a time, there was a little girl named Lila who loved to learn about science. She learned about a process called combustion, which is when something burns and releases energy.
One day, she discovered a strange compound that looked like glitter, but it was actually a special substance that could cause combustion when its concentration was just right.
Lila wanted to experiment with the compound and see what would happen when it decayed, so she set up a small test in her backyard.
She found that as the compound decayed, its concentration changed, causing it to suddenly ignite and burn brightly!
Lila was amazed by the power of science and couldn't wait to learn more about the world around her. The end.

Reflections

1. What is combustion?
2. What is a compound and how did Lila discover it?
3. How does the concentration of the special substance affect combustion?
4. What happened to the substance as it decayed?
5. What did Lila learn about science from her experiment?