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The horizontal fraction bar was introduced by the Arabs.
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.