What is HRV? What the smartwatch and Oura ring metric can really tell you about your health

On the flip side, a low HRV — less variation between beats — can indicate your body is stuck in “fight-or-flight” mode. That ...
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31 common items that are so widely misused you might not even know their original purpose

All of these items have been marketed for one purpose, but customers decided that they're better at doing something else ...