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If all the neurons in the human body were lined up, they would stretch more than 600 miles.

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Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.

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An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.

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Thyroid conditions may make getting pregnant impossible.

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The shortest mature adult human of whom there is independent evidence was Gul Mohammed in India. In 1990, he was measured in New Delhi and stood 22.5 inches tall.

Lichen structure Lichen structure
Pocket gophers and ecosystem structure (data from Huntly and Inouye 1988). Pocket gophers and ecosystem structure (data from Huntly and Inouye 1988).
The structure of skin (a) and epidermis (b) at the microscopic level. The structure of skin (a) and epidermis (b) at the microscopic level.
Hurricane Structure Hurricane Structure
Lines of the posterior thorax Lines of the posterior thorax
The general structure of DNA transposons The general structure of DNA transposons
Video: Metaphase I Animation

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