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Computers are extremely fast , but programming computers to do something useful is extremely slow . The strains or varieties available are extremely susceptible to downy and powdery mildew , two serious diseases of other cucurbits in Florida . Second , the institutional structure in which economic decisions are embedded is extremely complex and vitally important for how markets work . One product sold for fire eating was removed from the market because the chemicals which were used to make it colourless and odourless were extremely dangerous . " If the three rules for LAM are followed , the probability of becoming pregnant is extremely small , " says Dr. Roberto Rivera , FHI corporate director for international medical affairs , one of the experts at the meeting .