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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
There are 60,000 miles of blood vessels in every adult human.
Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.
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.