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Skinner also complained that he had asked department leaders to send a message to all employees explaining what his office does , and how to contact it . That was when computer scientist Leonard M. Adleman of the University of Southern California , using techniques from molecular biology , manipulated strands of DNA to solve a mathematical problem : Given seven points linked by one-way paths , find a route that visits each point once on the way from a specified starting point to a given end point . Until reflection phase gratings came along , there really were no surfaces designed to spread sound around in both space and time . When Achilles had covered that tenth , the tortoise would have covered an additional one-hundredth , and so on . That way , both share the political heat . Here 's another generalization that comes out of Schlatter 's work : Any design with an odd number of rows and an odd number of columns with an odd number of horizontal mirrors ca n't be drawn as a single loop . The wide-open vistas look very much like suburban Houston , not at all like the crowded streets of Cairo and Alexandria or the remote , dusty villages of rural Egypt where many Copts lived . " The spinach contamination may have had a spillover effect to other produce items , " said Ed Mackowiak , vice president of sales for FreshLook Marketing . House Democrats , encouraged by labor organizations , have been pressing the Senate to pass a " clean bill " without any added provisions . ' " Eddington 's insistence on developing a completely deductive model of the universe was a manifestation of his " belief and ultimate faith in a whole-number interpretation of the world , " Durham contends . For each of the two versions of the game , Robinove drew 100 initial hands , totaling 700 letters , then looked at the vowel frequency . Each of the other digits also turns up with approximately the same frequency , showing no significant departure from predictions . " There 's a lot of skittishness on both sides about coming to the table , " said Sen. Judd Gregg of New Hampshire , the top Republican on the Senate Budget Committee . That 's because it 's virtually impossible for one political party to pass politically painful cuts to programs such as Medicare all by itself , but the job can be made easier if both parties agree to make the leap . Sales figures through Dec. 23 from 16,000 conventional supermarkets , not including big-box stores such as Wal-Mart or Costco , showed an overall 14 percent drop in spinach sales from a year ago , according to the Perishables Group . " Now , look , my diction is n't all that good , " the president said . He said the draft letter had been " sitting in the general counsel 's office " since last summer . Teng Leng Ooi of the Southern College of Optometry in Memphis , Tennessee , and her coworkers set up an ingenious experiment in which volunteers wore goggles equipped with prisms and looked at illuminated objects against a dark background . " 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 . Both puzzles present interesting and varied challenges . " I would love to see them come back . President Bush used the same economic reasoning when he rejected the Kyoto Protocol in 2001 , an international treaty requiring 35 industrial nations to cut their global-warming gases by 5 percent on average below 1990 levels by 2012 . My great wish is that before I die , all my sons will be living in Lebanon . In 1927 , van der Waerden proved the following generalization : If n is a sufficiently large integer and if each integer from 1 through n is printed arbitrarily in one of two colors , there is always a monochromatic arithmetic progression with a certain number of terms . " Despite such difficulties , the mathematicians succeeded in demonstrating that the sequence contains all positive integers - - something that is not immediately obvious .