If you've ever wanted to move, build or take something apart, you need tools. The most basic of these are called simple machines. Used alone or in combination, they allow us to do the jobs we need to do. They are levers, wheels and axles, pulleys, inclined planes, wedges, and screws.
Here are some different ways to learn more: quiz yourself, learn their history, build something fun, work on the math and find out how they are used in a job setting. See how simple machines might have built a mystery castle. If, after all that, you can't remember what they are, here's a catchy tune to help jog your memory.
Need more information? Visit your local library.