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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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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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Famous people who died from poisoning or drug overdose include, Adolf Hitler, Socrates, Juan Ponce de Leon, Marilyn Monroe, Judy Garland, and John Belushi.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.