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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
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.
Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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.