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56 pages, Hardcover
First published June 1, 2021
"Today we were making family trees. Wanda's was the longest. Ralphie's was the funniest. Arnold's was the shortest."When young Arnold says a wish to know more about his ancestors, Ms. Frizzle LEAPS at the chance to teach him about ALL of his ancestors.
And of course, by ALL of his ancestors, Ms. Frizzle sets up the bus to take them back to the verrrrrry beginning - the amoeba stage!
"A trip? I didn't mean it! I take it back!"
"No backsies, Arnold."