On the surface, the article is weak: "vital signs" is not defined; the most precision we have is that it measures heart rate. But, my fitbit already does that.

On the surface, the article is weak: "vital signs" is not defined; the most precision we have is that it measures heart rate. But, my fitbit already does that. Vital signs, in my own experience, includes blood pressure, pulse rate, temperature. My fitbit doesn't do BP or temperature. Would be nice to know more about this project.