Our heart beats about 100,000 times every day, pumping blood to every cell in our bodies. This adds up to about 35 million beats a year and 2.5 billion beats in an average lifetime. Medical science tells us that every contraction is similar to the effort it would take for us to hold a tennis ball in our palm and give it a good hard squeeze.
via Our Daily Bread http://ift.tt/1AcHIvG
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