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Did you know?
Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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There are approximately 3 million unintended pregnancies in the United States each year.
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Drugs are in development that may cure asthma and hay fever once and for all. They target leukotrienes, which are known to cause tightening of the air passages in the lungs and increase mucus productions in nasal passages.