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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.
Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.
The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
Your heart beats over 36 million times a year.
Blood is approximately twice as thick as water because of the cells and other components found in it.