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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.
In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
Adolescents often feel clumsy during puberty because during this time of development, their hands and feet grow faster than their arms and legs do. The body is therefore out of proportion. One out of five adolescents actually experiences growing pains during this period.
There are over 65,000 known species of protozoa. About 10,000 species are parasitic.


