Doudna, Kelly  1963- <br/><br/>
The kids' book of simple machines :  cool projects and activities that make science fun / 
Kelly Doudna 
 - 144 pages :  color illustrations ;  22 cm 
<br/><br/> Includes glossary and index 
<br/><br/> Introduces six simple machines, describing how they work in more complex machinery and how they are used every day. 
<br/><br/> Primary 
<br/><br/>
<br/><br/><label>ISBN: </label>9781938063596 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Simple machines--Juvenile literature
<br/><br/><label>Dewey Class. No.: </label>621.8