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About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.

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Most women experience menopause in their 50s. However, in 1994, an Italian woman gave birth to a baby boy when she was 61 years old.

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The calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.

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In 1864, the first barbiturate (barbituric acid) was synthesized.

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Persons who overdose with cardiac glycosides have a better chance of overall survival if they can survive the first 24 hours after the overdose.

Endocrine system. Endocrine system.
The digestive system: functions of the small intestine and large intestine (colon) The digestive system: functions of the small intestine and large intestine (colon)
Thyroid System Thyroid System
The lymphatic system. The lymphatic system.
Relationship between thymidylate synthase and enzymes of tetrahydrofolate metabolism Relationship between thymidylate synthase and enzymes of tetrahydrofolate metabolism
Saturn and its Ring System "زحل ونظامها الدائري" Saturn and its Ring System "زحل ونظامها الدائري"
Video: System organization - PPM system types (Somatic, Autonomic & Enteric) and Reflex arc types

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