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Tech Fix: Apple Watch Series 4 Review: Faster, Bigger, With a Promise to Be Healthier

A few days ago, I sat in a medical recliner at the University of California, San Francisco. A cardiologist placed 10 stickerlike electrodes onto my limbs and chest and then connected the wires to a dated-looking contraption with a screen and a keyboard on a cart.About a minute later, a printer produced a chart of my heart’s electrical activity on red graph paper. The procedure I had undergone was an electrocardiogram, or an EKG, which is used to diagnose cardiac problems like arrhythmia and heart attacks. I took the test to gain a better understanding of the implications of the Apple Watch Series 4, Apple’s new smart…

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