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Pacemakers Got the Beat

October 9, 201336 min
What is a pacemaker? How do pacemakers control the rate of heartbeats? What was the first pacemaker?Learn more about advertising on the HowStuffWorks podcasts at www.howstuffworks.com/advertisers.htmAnd to learn about your ad choices when listening to podcasts, visit https://www.howstuffworks.com/privacy.htm#ad-choices