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Did you know?
There are more nerve cells in one human brain than there are stars in the Milky Way.
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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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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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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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More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.