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Did you know?
Everyone has one nostril that is larger than the other.
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There are more sensory neurons in the tongue than in any other part of the body.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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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.