|
|
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.
People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
The longest a person has survived after a heart transplant is 24 years.
The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
Blood is approximately twice as thick as water because of the cells and other components found in it.