There's a feature on the Apple Watch that is intended to be able to detect your stress. And a new study claims that it actually works not only to detect your stress, but to predict it too. Or, rather, your Apple Watch can predict when you're not stressed out — which is kind of stressful.

The existing feature allows Apple Watch owners to take an electrocardiogram — also known as ECGs or EKGs — with the ECG app directly through their watch. ECG tests record the timing and strength of your...

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