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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

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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 familiar sounds of your heart are made by the heart's valves as they open and close.

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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.

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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.

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