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Asthma occurs in one in 11 children and in one in 12 adults. African Americans and Latinos have a higher risk for developing asthma than other groups.
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.
There are more nerve cells in one human brain than there are stars in the Milky Way.
Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.
After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.