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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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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.