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...

Halley Harper, Science Girl Extraordinaire: Secret Rock Aftershock is a fantastic adventure-filled book. Penned by Tracy Borgmeyer, it provides a fun, engaging, and informative way for children to learn about science and rocks. Halley Harper, a ten-year-old science girl, is on a live TV show....