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This difference of perspective is fundamental , infecting the intuitions with which all theorizing must begin , and it is thus the source of some of the deepest and most persistent disagreements in the field . Comments requested the shorter minimum prior notice time because the source of some food products often is close to the U.S. border , and some products are perishable . Rather , they are relationships held together because each individual regards the other as the source of some advantage to himself or some pleasure he receives . A Whole Lot of ColorsThe original Colortron instrument included an internal battery , making it portable ( this battery was also the source of some of its chronic problems and was removed from the instrument as a result ) . The basement is not a part of the house often frequented but it can be the source of some of the most polluted air in the home .