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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 familiar sounds of your heart are made by the heart's valves as they open and close.
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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
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The calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.
People have seen patterns in the stars since ancient times.[5] This 1690 depiction of the constellat
In the heat of the Battle of Lake Erie, Perry had to abandon his flagship, the Lawrence, which had b