Halley Harper, Science Girl Extraordinaire: Summer Set in Motion is a children's adventure novel written by Tracy Borgmeyer. Nine-year-old Halley Harper is a science prodigy. Labeled lovingly as Miss Disaster by her parents due to her tendency to cause minor accidents like clogging up sinks...

Tracy Borgmeyer's Halley Harper, Science Girl Extraordinaire: The Friendship Experiment is entertaining and inspiring. Ten-year-old Halley Harper has a great enthusiasm for science. She loves trying out new experiments with her best friend, Gracelyn. But the experiments don't always go as intended. Like last year...