Why Do Things Differ?

Duration: 29

Format: 16mm

Color: B&W

Description: Dramatizes the questions raised in Darwin's mind on his return to England from his famous voyage. Discusses why animals differ when found in different locations, why and how species arise, and if new forms appear suddenly. Uses graphic illustrations, slides, and live animals to explain simple concepts of the origin of the species. (WGBH-TV) Kinescope.