Simple machines / 
[video recording] disney Educational Produtions. 
 - 1st ed. 
 - Elk Grove Village, Illinois :  Disney Educatonal Productions. 
 - Bill nye the Science Guy .
<br/><br/> 1 videocassette 26 minutes 
<br/><br/> What are simple machines? How do simple machines help us work? What is a wheel? 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Simple machines.