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As if there are n't enough stargazing groups in the area , teachers from Fairfax , Arlington and Prince William counties belong to an informal organization called the Northern Virginia Planetarium Society . So long as common natures in some sense played a role in the signification of common nouns , there was a strong temptation to speak as if there are individual natures which play a similar role in the signification of singular terms . Both sponsors recognized that there are no other cemetery prairies in Illinois that were concerned with this issue , and therefore they agreed that it was unnecessary to potentially impact 15 other nature preserves . The United Nations currently estimates that there are between 75,000 and 112,000 IDPs in Chad . This includes maintaining a strong security posture by being aware of their surroundings , avoiding crowds and demonstrations , keeping a low profile , varying times and routes and notifying the U. S. Embassy in case of any change in the local security situation as well as if there are changes in their contact information . AAMA estimates that there are about 130 companies in Alabama whose operations are dedicated mainly to automotive manufacturing . Internet Filter Review estimates that there are 4.2 million porn Web sites 12 percent of the total amount of sites allowing access to 72 million worldwide visitors annually . As if there are n't already enough challenges to fair elections , this conflation of personal history or charisma with a candidate 's political stances is helping to keep voters from being informed about the real issues - - the ones on policies - - when they cast their ballots . Investigators have known for decades that there are 10 to 15 ganglion cell types in the retina that are adapted for picking up different movements and then work together to send a full picture to the brain . I have related this little experiment several times since it happened , so I apologize if there are those in the audience who have heard me tell it before .