Best friends Cora and Shelly, who build sandcastles every day on the shore, confront the challenge of Shelly moving to the city.
"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."--Provided by publisher.
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