So your fitness tracker told you that your HRV dropped last night.  Now what?  Well, Span takes all of the health data from wearables, combines them, and provides unique individualized experiments for you to do before offering tangible advice, ongoing dietary and mental health suggestions, and professional consultations on demand.  It answers the question - what do I do now?  Patrick Samy, CEO, talks to us about how it works, how to live forever, why tennis is the best, and his personal 80/20 rule.