Best friends Adi and Gabi love to play with Adi's toy train. Round and round it goes--choo choo! Watching it loop the track gives the girls an idea. These scientific thinkers use their computer coding knowledge to put the train to work!

About the Author

Caroline Karanja is a developer and designer who is on a mission to increase accessibility and sustainability through technology. She enjoys figuring out how things work and sharing this knowledge with others.

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