Stickmen's Guide to Your Beating Heart

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Stickmen's Guide to Your Beating Heart

From the Series Stickmen's Guides to Your Awesome Body

Ba-boom, ba-boom, ba-boom . . . your incredible heart beats more than once every second, no matter what you're doing. And your lungs pull in up to 145 gallons of oxygen each day. So how are… Read More →

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