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Did you know?
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.
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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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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.