Leaked details of the new iPhone models were quickly relegated to second tier headlines after Apple’s latest product announcement. More people seem to be excited about the fact that the new Apple Watch will come with a built-in heart monitoring electrocardiogram (ECG) function. An ECG is a simple test that can be used to check your heart’s rhythm and electrical activity, designed to detect any underlying issues. The Apple Watch 4 will be the first mainstream wearable gadget to integrate this kind of medical diagnostic technology. (Other devices such as the Fitbit typically measure blood flow by shining a light…

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