Curious Pearl Tinkers with Simple Machines: 4D an Augmented Reading Science ExperienceHardcover, 1 August 2018

Curious Pearl and her brother don't really like to do chores. They'd rather play with their kitten. But Dad looks serious, so Pearl and her brother come up with a solution. They build a contraption to help them with their chores. As they build, Pearl teaches her brother all about simple machines.