We all know the earth is round. But HOW do we know? Join intrepid young scientist-adventurer Joulia Copernicus as she takes readers on a historical journey through time and space. From jumping on board Columbus's ship to planet-hopping in the outer reaches of our solar system, Joulia explains with humor and wit the ins and outs of how we learned that the earth is round.

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"An amusing, thought-provoking presentation in which observations and reason lead to a sound conclusion." Starred Booklist Review

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"This lighthearted addition to the STEM shelf encourages children to question, hypothesize, experiment, and observe. (Informational picture book. 6-9)" Kirkus Reviews