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On a flat surface , the shortest distance between two given points is along a straight line . On a clear , moonless night , we see thousands of stars scattered across the sky . On the agent scale , individuals tend to move from firm to firm , staying in one place an average of 3 to 4 years . Despite being immensely popular in national polls , Giuliani faces hurdles to securing the Republican nomination state by state . At least 17 other states are debating whether to require the vaccine , including California , New Jersey and Virginia , as well as the District of Columbia . Although much about headaches still is n't understood , some researchers think migraines may be caused by functional changes in the trigeminal nerve system , a major pain pathway in your nervous system , and by imbalances in brain chemicals , including serotonin , which regulates pain messages going through this pathway . On the surface of a sphere , the shortest distance is along a segment of a great circle passing through the points . " The Democratic caucus values the exchange of different ideas , " Clyburn said . It 's the " Stonehenge Watch , " advertised as a " great leap backward in time .