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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.
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The average office desk has 400 times more bacteria on it than a toilet.
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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.