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" Two parameters determine when this happens and ultimately what the image looks like : the distance advanced by each creature at each iteration of the process . She worked as a high school mathematics teacher until 1995 . Perhaps the reason for this , Schroeder reasoned , is related to another finding that listeners prefer to hear somewhat different signals at each of their two ears . Incirlik was the northern base for warplanes enforcing no-fly rules against Saddam Hussein 's Iraq after the 1991 Persian Gulf War . The national telephone survey of 1,200 people was conducted over three weeks in November , more than six weeks after the spinach recall but before the Taco Bell outbreak . Consumer preference for spinach-free salads led Pacific International Marketing to stop growing and selling the baby spinach it used to put into salad mixes , said Tom Russell , president of the grower and shipper of leafy green vegetables in Salinas , Calif. Sales of salad mix took a roughly 50 percent hit after the September E. coli outbreak , and the mix is now selling only about 75 percent as well as it had been , he said . In a sign that he 's serious about running for the White House , the two-term mayor filed a so-called " statement of candidacy " with the Federal Election Commission , indicating that he would seek the presidency as a Republican should he decide to go forward . Ceiling reflections produce very similar signals at each ear . The White House issued a statement less than four hours after the report 's release defending Bush 's six-year record on global climate change , beginning with his acknowledgment in 2001 that the increase in greenhouse gases is largely because of human activity . " An important difference is that our packs tend to be composed of the same competitors throughout , " Ackland and Butler said . It 's the " Stonehenge Watch , " advertised as a " great leap backward in time . It is part of our honoring the diversity that makes us who and what we are as a nation , " he said . " He claimed that all such numbers were interconnected and functions of time , " Durham says . Suppose that a person stands at each corner of a square traced out on the ground .