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The Pentagon has a laser that can identify people from a distance—by their heartbeat | MIT Technology Review
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How to Read a Hospital Monitor: Understanding Vital Signs
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Heart rate | Description, Monitoring, & Facts | Britannica
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Guide to DIY Heart Rate Monitors (HRMs) & Handheld Real-Time ECG MonitorsAtrial Fibrillation: Resources for Patients
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Watch your heart beat: Is your fitness band lying to you? | | Resource Centre by Reliance Digital
Heartbeats can now be measured wirelessly | WIRED UK