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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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Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).

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Medication errors are three times higher among children and infants than with adults.

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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").

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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.

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