Charli Explores STEM¿ #3. Transitional Chapter Book. Grades 2-3. Approximately 2,500 words, 96 pages. Encourages girls to engage in and pursue STEM education and careers. When Charli meets an engineer at Career Day, she can't stop thinking about what it would be like to be an engineer herself. Soon, she is lost in an engineering daydream. When a rescued dolphin is ready to be released, Charli is asked to make a mobile device to keep track of it.

But can she figure out a way to attach the device to the dolphin--and to make sure it will work in the ocean?.