Science Matters: Screws

Science Matters is a series of books dedicated to inspiring young readers with a lifelong curiosity about science and the world.
Screws can be found all around you. They are used in furniture, drills, garage doors, and some musical instruments. Many people keep small screws around the house to use in building projects.
Screws are tube-shaped tools with sharp edges called threads spiralling around them. They are often used to fasten objects together, such as metal, stone, and wood.