Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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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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About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.
Darwin’s finches: Adaptive radiation of bill types.