We all know the earth is round. But HOW do we know? Join intrepid young scientist-adventurer Joulia Copernicus in this engaging picture book as she takes readers on a STEM historical journey through time and space. What would happen if you tried to walk tothe edge of the earth? Would you find it? Joulia Copernicus explores these questions and more in this fun and informative book for young readers, the first in the Joulia Copernicus series. From jumping on board Christopher Columbus’s ship, to planet-hopping in the outer reaches of our solar system, Joulia explains he ins and outs of how we learned that the earth is round with humor and wit. Ellie Peterson's clear, concise language and bold, kid-friendly make this book ideal for kids interested in science, history, and the world around us.