Bear Networks: A children's book about the mathematics of networks
Chris Bick (VU Amsterdam), Raffaella Mulas (CTA\(^2\), VU Amsterdam) and Piergiorgio Mulas (Raffaella's dad, who is an illustrator) authored a mathematics book for children about graphs, hypergraphs, and synchronization!
It is titled "Bear Networks", and it is available on Zenodo: