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They may also signal temporal arteritis — a rare , headache-related condition that usually affects people older than 55 and , if not treated , may lead to blindness or stroke . " Once they reach this level of morbid obesity , the vast majority go on to be obese adults , " he said . The wide-open vistas look very much like suburban Houston , not at all like the crowded streets of Cairo and Alexandria or the remote , dusty villages of rural Egypt where many Copts lived . At low volume , cars move more or less independently , achieve a preferred speed , and change lanes as required . I know from personal experience that a glass Klein bottle on display invites attention and , inevitably , questions about whether it can actually hold liquid and , if so , how you would drink from it .