2.5 billion. No, it's not how old the Earth is. It's the average amount of times the heart beats in a lifetime, according to the American Heart Association. A quick review on this important organ: The ...
Dear Dr. Donohue: Recently, while walking on my home treadmill, I stepped off to check my pulse. I did so by pressing two fingers on my left neck artery. I had to press rather hard to find the pulse.
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