5 books in series

Science Solves It!®

Science Solves It!® is a 5-book series with 5 released primary works first released in 1966 with contributions by Jennifer Dussling, Mary Lawrence, Daphne Skinner, and Sarah Albee.

Almost Invisible Irene
What's That Sound?
The Longest Yawn: Involuntary Reflexes
Clever Trevor
The Longest Yawn: Involuntary Reflexes