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" In one surprising result , the researchers found that coins sold in auctions that end on a weekend sell for about 2 percent more than coins sold in auctions that end on a weekday . Starting in 1999 , Woods and Kauffman gathered information on a total of 7,362 eBay transactions involving rare coins . " Happersett 's approach to mathematical art focuses on algorithms . The use of reflection phase gratings to diffuse sound helps create a listening environment in the home and elsewhere that allows a listener to experience an old-fashioned concert-hall ambience . Until reflection phase gratings came along , there really were no surfaces designed to spread sound around in both space and time . The algorithms that Taubin developed worked well even in the vicinity of cusps and other singularities . The steps today , including eliminating the phrase " testing the waters , " put Giuliani on the same level legally as McCain and Romney , the other top-tier GOP candidates who have formed regular exploratory committees and filed statements of candidacy .