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Iraq continues to weigh on the nation 's finances , accounting for well over half of the current year 's projected deficit of $ 244 billion . " Nonetheless , Euler 's homework represents a remarkable achievement . In each case , it 's the extra half wavelength that decides when waves cancel each other out . " This is not a tradeoff the American people want . Bulk spinach dropped by nearly half and even packaged salad without spinach dropped about 10 percent . " Bush said $ 245 billion is needed for military and diplomatic operations in Iraq and Afghanistan over the next year and a half , bringing total Pentagon funding for the wars to $ 662 billion . Ackland and Butler reported that the threshold depends on a single criterion : the fraction of competitors in a given event who encounter others and can stay with them . An association poll of 427 U.S. dentists in 2004 found that about half offered services including headphones , neck rests , warm towels and free snacks , while about 5 percent offered more spa-like amenities such as massages , facials and manicures . For designers , it was like trying to type a paragraph without using , say , the letter " d. " Now that improved digital recordings , electronic instruments , and home theater systems are readily available , demand has increased for superior acoustic surroundings for making and listening to recordings .