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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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There are 60,000 miles of blood vessels in every adult human.

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

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During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.

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Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.

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