Circulatory system: Blood vessels Laid end-to-end, an adult's arteries, veins and capillaries would stretch for about 100,000 miles - enough to wrap around the world nearly four times.

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As the video zooms in on some of the most active and interesting currents around the globe, the NASA oceanographer Josh Willis details how this aquatic circulatory system affects human life, from ...

Erin Bendig has extensive experience in various areas of personal finance. She previously worked as a staff writer for Kiplinger.com, focusing primarily on savings accounts and banking. In ...