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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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Most fungi that pathogenically affect humans live in soil. If a person is not healthy, has an open wound, or is immunocompromised, a fungal infection can be very aggressive.
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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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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.