Rooney and Axel sit side by side and pass each other books, a steady signing assembly line as they work their way through a tall stack of the children’s books they’ve published together, written by Rooney, illustrated by Axel. Rooney’s academic background is in science, and Axel’s a painter. Three years ago, they published their first book about exploring nature and taking care of the environment. Since then, they’ve published three more, featuring a group of kids who go on adventures and learn about the earth—everything from marine life to native plant habitats, growing a garden to weather
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