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As a result , The International Headache Society uses the term tension-type headache instead of tension headache , calling attention to the fact that muscle tension may not be the main cause of this kind of head pain . A headache calendar can offer valuable clues that may help your doctor diagnose your particular kind of headache and discover possible headache triggers . At http://home.netcom.com/~bitart/ , you can view a wide variety of spirolateral designs , try out your own variants of the rules for creating such patterns , and order personalized cards with the chosen images . In recent years , mathematicians have started to study new variants of these integer-coloring problems . While it may require the support and expertise of elite circles to organize something like an intellectual property preserve , and though the activities and even the existence of such a preserve might be invisible to most people , a preserve could mount a fundamental challenge to our definitions of public and private property . " Even if we were successful in accomplishing some kind of debate and discussion about what caps might be here in the United States , we are a small contributor to the overall , when you look at the rest of the world . The 1976 US copyright law made provisions on how this can be accomplished for one electronic collection , television news programs , and put in provisions of what lending such material means ( see sections 108 ( f ) 3 in Copyright Law of the United States of America [ Copyright Law ] . " Only by taking infinitesimally small units for observation ( the differential of history , that is , the individual tendencies of men ) and attaining to the art of integrating them ( that is , finding the sum of these infinitesimals ) can we hope to arrive at the laws of history , " Tolstoy argued . A high level of the wrong kind of cholesterol in your blood increases your risk of a heart attack .