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The circulatory system
The circulatory system is more than 60,000 miles long.
If a child’s entire circulatory system—we’re talking veins, arteries, and capillaries—were laid out flat, it would stretch for more than 60,000 miles, according to the Franklin Institute. By the time we reach adulthood, our bodies have become home to approximately 100,000 miles of blood vessels. That’s just one of the mind-blowing facts that sound made up (but aren’t).
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