If you were building a tree house, what could you use to keep the boards together? You could use nails, but you might also use screws! In Screws Keep Things Secure: Simple Machines for Kids, readers ages 5 to 8 learn how a screw''s shape can pull things together or push things apart or even move heavy objects from one place to another! Glossary, photos, and a hands-on activity make this book fundamental for STEAM learning.
