Does your coat have a zipper? Did you eat breakfast with a fork? You're using simple machines! From butter knives to seesaws, rolling pins to catapults, we are surrounded by simple machines! Simple Machines! With 25 Science Projects for Kids astounds readers with the ingenuity they already possess and inspires them to look differently at the objects they use every day. What do a fork and an axe have in common? How do pulleys get a...