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WiFi signals can measure heart rate—no wearables needed
(news.ucsc.edu)
This is a most excellent place for technology news and articles.
Hm I'm not sure I'd say it's perfect? I thought 70-80 was?
My cardiologist said it isn't really "danger zone", but if it were like 100+ it might be concerning.
I have had all the scans done, including a close look at my hearteries, and everything came back (surprisingly) clean.