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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.
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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
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There are approximately 3 million unintended pregnancies in the United States each year.
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There are more sensory neurons in the tongue than in any other part of the body.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.