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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 eye muscles are the most active muscles in the whole body. The external muscles that move the eyes are the strongest muscles in the human body for the job they have to do. They are 100 times more powerful than they need to be.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.