Word: ditherings
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Dates: during 1960-1969
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...vicious enemy showed its deceptively pretty face. A delicate, floating water fern named Salvinia auriculata appeared in patches that spread with astonishing speed. By last week dense mats, some of them strong enough to support a man, covered 15% of the lake, and local scientists were in a dither. Professor Boris I. Balinsky of Johannesburg's University of the Witwatersrand warned that Salvinia might turn the lake into a swamp and eventually...