The Questioneers chapter book series follows Ada Twist Scientist and her curious friends as they investigate the world around them. The STEM loving friends are Ada Twist Scientist, Rosie Revere Engineer, Iggy Peck Architect, Sofia Valdez Future Prez, and Aaron Slater Illustrator. Each friend is the main character of a chapter book in the series & the group uses science, technology, engineering, and math to solve their way out of a problem. These longer chapter books are different from the Questioneers picture books in which each friend is introduced and give more background on each character. The beloved Questioneers have been adapted into an animated series on Netflix in 2021.