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Join Catherine the Great on a fun-filled ride as she schemes to invent the roller coaster in this inventive, STEM-based nonfiction picture book!Empress Catherine the Great, Queen of Russia loved her country, especially the snowy winters. Giant ice slides meant daring drops and thrilling rides for all! But every spring, warm weather melted the snow and the slides. What could Catherine the Great do to ensure fun all year round? With some ingenuity and some royal thinking, Catherine the Great would create her greatest invention!