If you mean aerial drones, some number more than 670,000 UAVs have been registered by the FAA. It has been estimated that something like 1 million will be flying by the New Year 2018. I guess that some 50 industries use drones with something like 30,000+ women and men learning to be commercial, etc pilots.
1 Secondary amenorrhoea is where an established menstruation has ceasedâfor three months in a woman with a history of regular cyclic bleeding, or nine months in a woman with a history of irregular periods. 2  This usually happens to women aged 40â55.
This may appear as primary amenorrhea, which is the lack of menstruation before age 16. Secondary amenorrhea occurs in women who have had normal menstrual cycles that have stopped for six months or more. A very long list of reasons exists for amenorrhea, and a doctor will run multiple tests to diagnose the cause.