Tracking your heart rate? 5 questions answered about what that number really means

Trying a new exercise routine? Strapping on a new wearable monitor? An expert in human physiology explains the ins and outs of your heart rate and why it’s a valuable number to understand.

Curious Kids: What is hydroelectric energy and how does it work

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Take $20 off Fitbit's newest fitness tracker in any color

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How do pacemakers and defibrillators work? A cardiologist explains

Curious Kids: What is hydroelectric energy and how does it work

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21 Free Personality Tests You Can Take Online Today

Können Fitness-Tracker Krankheiten entdecken?

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