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No drugs are available to relieve parathyroid disease. Parathyroid disease is caused by a parathyroid tumor, and it needs to be removed by surgery.

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Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.

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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.

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The human body produces and destroys 15 million blood cells every second.

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There used to be a metric calendar, as well as metric clocks. The metric calendar, or "French Republican Calendar" divided the year into 12 months, but each month was divided into three 10-day weeks. Each day had 10 decimal hours. Each hour had 100 decimal minutes. Due to lack of popularity, the metric clocks and calendars were ended in 1795, three years after they had been first marketed.

In dihedral symmetry, all subunits can be related by rotation In dihedral symmetry, all subunits can be related by rotation
Pediatric growth chart. Pediatric growth chart.
Aerial view of old hutong area, Beijing. Aerial view of old hutong area, Beijing.
Procedures and Diagnostic Tests Related to the Female Reproductive System Procedures and Diagnostic Tests Related to the Female Reproductive System
(a) Varicella zoster virus recurring as shingles, a painful rash limited to an area enervated by 1 ... (a) Varicella zoster virus recurring as shingles, a painful rash limited to an area enervated by 1 ...
Calculating the area of a circular ring Calculating the area of a circular ring
Video: What is Reverse Osmosis?

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