LeversDVD - 2004
The inhabitants of Mammoth Island are trying to find the best method to weigh their heaviest mammoths. A young islander is inspired to try a simple machine called a lever to get the job done. Three classes of levers are then explored.
Publisher: Wynnewood, PA : Schlessinger Media, 
Characteristics: 1 videodisc (ca. 13 min.) : sd., col. ; 4 3/4 in. + 1 teacher's guide