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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.