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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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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.

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Most fungi that pathogenically affect humans live in soil. If a person is not healthy, has an open wound, or is immunocompromised, a fungal infection can be very aggressive.

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The longest a person has survived after a heart transplant is 24 years.

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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.

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