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I found out about it at the airport as I was coming back with Varlen Soskin from vacation . You can change it at will , but there may be a delay of a second or so before the change has any effect . I have seen scientists making experiments with it at the Agricultural College at Guelph , so that its value as a cover-crop , or substitute for manure , might be accurately estimated . Another example is the efforts by various entities to import the spirit , sometimes even the letter , of Section 508 into their design of noncovered E & IT or even into their design of systems and interfaces that do not meet the definition of E & IT at all . But what can they say to this , or can they face it at all ?