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My 13-year-old son read these after watching me dissolve into laughter while reading them.
There's a scene in Evolution when Callie Vee tries to learn to make pie dough that reduces me to tears and stitches, each and every time I read it.
In Curious, when my son got to the part where Callie Vee discovers her father values her exactly half as much as her brothers, he marched into my room and demanded: "Why? Why did he do this? This is just wrong."
The publisher offers a bare-bones teaching guide for the books, as well. It's aimed at CC Standards in grades 4-6, in part because Social Studies CC Standards touching on civil rights and women's rights, is not really addressed in the upper grades (8-9).