The Nature of Things

Cystic Fibrosis / Whooping Crane / Cold-Water Survival (21x2)

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A report on cystic fibrosis, a genetic respiratory ailment that afflicts young people; and a profile of one of its victims, 24-year-old nurse Susan McKellar. Other segments examine the International Crane Foundation's efforts to save the whooping crane from extinction; and research into cold-water survival techniques.