Word: blowfish
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Dates: during 1945-1945
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...Kangaroos, blowfish and pelicans use flexible sacs. "The material rather than the shape is the critical factor . . . it must be light, strong, flexible and impervious. . . . Now in . . . aluminum and magnesium we have the means." Storage tanks have been built with flexible roofs of these metals. A slight difference between outside and inside atmospheric pressure balloons the roof...