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Did you know?
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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If you could remove all of your skin, it would weigh up to 5 pounds.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Asthma occurs in one in 11 children and in one in 12 adults. African Americans and Latinos have a higher risk for developing asthma than other groups.
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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.