After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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The horizontal fraction bar was introduced by the Arabs.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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The term pharmacology is derived from the Greek words pharmakon("claim, medicine, poison, or remedy") and logos ("study").
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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
Paranasal sinuses are part of the upper respiratory system.
The male reproductive system.
A typical clean-in-place system
Female Reproductive System
Spinous process
In a metallurgical process the mineral pyrite, FeS2, is roasted in air: FeS2 + O2 Fe2O3 + ...