Award-winning videos for your home library. Since 1768 the encyclopedia britannica has been the worlds most respected source of knowledge. Some of the finest educational films and videos ever made are now available through the encyclopedia britannica dvd classics collection. Hundreds of award-winning films and videos cover topics in science physics animals social studies language arts health and more. includes: how nature protects animals some friendly insects problems of conservation: wildlife animals in the city specifications: language : english encoding : all regions format : color full-frame stereo sound ntsc rating : unrated subtitles : none approx runtime : 34 minutes other features : interactive menus note : this dvd is compatible with all ntsc players