2017 Finalist: Hands-On Science Book

Outdoor Science Lab for Kids: 52 Family-Friendly Experiments for the Yard, Garden, Playground, and Park, by Liz Lee Heinecke. Quarry Books, 2016. 

Contains 52 science experiments dealing with topics involving botany, physics, solar science, and ecology, including enough slime, bugs, and icky stuff to hold the interest of just about any curious kid.