|
|
Did you know?
There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
Did you know?
The longest a person has survived after a heart transplant is 24 years.
Did you know?
Blood is approximately twice as thick as water because of the cells and other components found in it.
Did you know?
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.
Did you know?
A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.