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Think of the inventions that went hand in hand with the work ; of the flails that were changed to threshers ; of the sickles that became cradles , and the cradles that were changed to reapers and headers - - of the wooden plows that became iron and steel ; of the spinning wheel that became the jennie , and the old looms transformed to machines that almost think - - of the steamboats that traversed the rivers , making the towns that were far apart neighbors and friends ; of the stages that became cars , of the horses changed to locomotives with breath of flame , and the roads of dust and mud to highways of steel , of the rivers spanned and the mountains tunneled . Chlamydia infection also can be diagnosed by cell cytology , enzyme-linked immunoassays , and PCR ; of all of these tests , PCR probably is the most reliable.Prior infection with mycobacteria , such as Mycobacterium tuberculosis , can be detected by intracutaneous injection of a dose of intermediate-strength tuberculin-purified protein derivative . As the caregivers and food providers of the community , women are best able to determine the needs and best means of distribution for their communities . Knowledge of practices and procedures for project control , construction , procurement , quality assurance , environmental safety and health ; of the EPC and TIC ( total installed cost ) businesses ; and of the proposal and bid processes . Today , we are engaged in a new dialogue that speaks the language of common interests - - of trade and investment ; of education and health ; of democracies that deliver not corruption and despair , but progress and hope ; of a common desire that children in all our countries will be free of the scourge of drugs . Day after day , we receive reports from the field of sickness and malnutrition ; of exploitation and rape ; of killings and indiscriminate bombings ; of recruitment and abductions .