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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.

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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.

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Asthma occurs in one in 11 children and in one in 12 adults. African Americans and Latinos have a higher risk for developing asthma than other groups.

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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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Drug-induced pharmacodynamic effects manifested in older adults include drug-induced renal toxicity, which can be a major factor when these adults are experiencing other kidney problems.

Hyperopia (farsightedness). In the uncorrected top figure, the image would come into focus behind th Hyperopia (farsightedness). In the uncorrected top figure, the image would come into focus behind th
Psoriasis. This photograph demonstrates the characteristic white skin patches of this condition. Psoriasis. This photograph demonstrates the characteristic white skin patches of this condition.
Common sites of amputation. (A) Upper extremities. (B) Lower extremities. The surgeon determines th Common sites of amputation. (A) Upper extremities. (B) Lower extremities. The surgeon determines th
Endocarditis. The human heart has been sectioned to reveal the left ventricle and origin of the aort Endocarditis. The human heart has been sectioned to reveal the left ventricle and origin of the aort
Philippine Tarsier (Tarsius syrichta), Philippine Islands, a threatened species. Philippine Tarsier (Tarsius syrichta), Philippine Islands, a threatened species.
Some threatened and endangered species Some threatened and endangered species
Video: Energy sources - types

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