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The human body produces and destroys 15 million blood cells every second.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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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.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Asthma occurs in one in 11 children and in one in 12 adults. African Americans and Latinos have a higher risk for developing asthma than other groups.