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The most common active ingredient of spermicides is nonoxynol-9. Spermicides containing nonoxynol-9 are available in many forms, such as jelly (gel), films, and foams. Used alone, spermicides have a perfect use failure rate of 6% per year when used correctly and consistently, and 16% failure rate per year in typical use. [1]
Medieval contraception is a debated topic among historians, though methods of contraception have been developed not just in modern times. In ancient times, women attempted to protect themselves from unwanted pregnancy with various means and practices, as evidenced by ancient records.
The history of water supply and sanitation is one of a logistical challenge to provide clean water and sanitation systems since the dawn of civilization. Where water resources, infrastructure or sanitation systems were insufficient, diseases spread and people fell sick or died prematurely. Astronaut Jack Lousma taking a shower in space, 1974
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The question of what constitutes history, and whether there is an effective method for interpreting recorded history, is raised in the philosophy of history as a question of epistemology. The study of different historical methods is known as historiography , which focuses on examining how different interpreters of recorded history create ...
Thank you, as a HIV educator for Aids Health Organization, we recommend all persons to use water base lubercant, due to spermicide irritation that allows HIV to enter into the human body. signed D.L. Sais —Preceding unsigned comment added by 72.73.26.150 ( talk ) 11:31, 23 August 2010 (UTC) [ reply ]
The history of water filters can be traced to the earliest civilisations with written records. Water filters have been used throughout history to improve the safety and aesthetics of water intended to be used for drinking or bathing. In modern times, they are also widely used in industry and commerce. The history of water filtration is closely ...
The recurrence of water poisoning, and large public health crises were a part of people's ordinary existence until scientific advances of the 19th century. After the Broad Street cholera outbreak of 1854, John Snow first identified the cause of cholera as drinking water being polluted by excrement.