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If all the neurons in the human body were lined up, they would stretch more than 600 miles.

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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.

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Everyone has one nostril that is larger than the other.

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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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It is difficult to obtain enough calcium without consuming milk or other dairy foods.

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