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Elderly adults are at greatest risk of stroke and myocardial infarction and have the most to gain from prophylaxis. Patients ages 60 to 80 years with blood pressures above 160/90 mm Hg should benefit from antihypertensive treatment.

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Approximately 25% of all reported medication errors result from some kind of name confusion.

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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.

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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.

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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.

Species richness of birds in North America. Species richness of birds in North America.
Andy Warhol, San Francisco Silverspot, from the series Endangered Species Andy Warhol, San Francisco Silverspot, from the series Endangered Species
A cerebral angiogram of a healthy human subject. A cerebral angiogram of a healthy human subject.
Human Viruses Associated with Cancers Virus Human Viruses Associated with Cancers Virus
Philippine Tarsier (Tarsius syrichta), Philippine Islands, a threatened species. Philippine Tarsier (Tarsius syrichta), Philippine Islands, a threatened species.
Events in human fertilization. The light micrograph shows a fertilized human oocyte. Events in human fertilization. The light micrograph shows a fertilized human oocyte.
Video: Biological organic compounds

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