All about sound / 
Schlessinger Media ; First Light Pictures, Inc. ; executive producers, Andrew Schlessinger, Tracy Mitchell & Paul Kramer ; producer Olga Palacio. 
 - 1st. ed. 
 - Wynnewood, PA :  Schlessinger Media,  2000. 
 - Schlessinger science library. Physical science for children .
<br/><br/> 1 videocassette (23 min.) : sd., col. ; 1/2 in. + teacher's guide. 
<br/><br/> Learn about sound from the source that creates it to the mechanics of the ear that hears it. Discover why sound needs a medium to travel, why there's none in space and why some animals see by using sound. Hands-on activity. 
<br/><br/><label>ISBN: </label>1572253398 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sound.<br/>Physical sciences.<br/>Video recordings for the hearing impaired.