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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 60,000 miles of blood vessels in every adult human.
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Everyone has one nostril that is larger than the other.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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ACTH levels are normally highest in the early morning (between 6 and 8 A.M.) and lowest in the evening (between 6 and 11 P.M.). Therefore, a doctor who suspects abnormal levels looks for low ACTH in the morning and high ACTH in the evening.