The Light Of The 21st Century: Wgbh (Television Station

Format: 16mm

Sound: sound

Description: The Light of the 21st Century Traces the development of lasers and discusses their applications in the fields of medicine, dentistry, construction, and communications.; Examines the traumatic geologic events that led to the shaping of the North American continent. Visits the Great Slave Lake in Canada's Northwest Territory, where the ancient rocks contain clues to the remains of earliest life and to the continental collisions that in three long periods of mountain building formed the mineral-rich Appalachians. Based on geologist Ronern's book, The Making of a Continent.

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