Computer Science for Kids

2. The Firefly Refuge

Standard: 2‐CS‐01: Understand how to improve the design of a computing device based on how it is used

You have built a firefly trapper prototype and are ready to demonstrate its capabilities to your Guide. While it simulates attracting and trapping the fireflies, however, you have only managed to catch one firefly in your hand. Perhaps it ventured near to you, drawn by curiosity, but now it seems frightened, beating its tiny wings against your hand and glowing fitfully.

The Guide walks toward you, and you can immediately sense disapproval and annoyance. Her glowing eyes flick toward you, and she snaps: “Why have you imprisoned my friend?” She pulls her cloak around her and stretches out her hand to the firefly. It flutters out of your hand and flies to her. She cradles it in her hand before releasing it into the night. As the firefly flies away, the Guide sighs. “Perhaps I didn't explain the outcome I'm looking for. We don't want to trap the fireflies into a prison, but rather we want to provide them with a home where they can find nourishment and rest.” You willingly agree to the Guide's suggestions.

“Fireflies have been frightened away by intruders with bright lights such as the ones you just added to your machine. Light pollution can harm animals just as air or water pollution can! Convert your trap to an enclosed, darkened space and make it sense the light levels outside. Fireflies also like a warm environment, so you can add a temperature sensor ...