Nothing better to do?

       Whimsically thinking of past fads. In the late 1970's machines calculating biorhythms were a popular distraction.  Circadian rhythm is familiar to us all. I shouldn't have been surprised to find calculators on the web. 

      This one tells me I've lived 21799 days.

     Froggy has a few more bells-and-whistles to play with.

     If you care to join Care2 then you may leave comments.

     The more grounded scientifically minded among us would more likely start at this wiki article about chronobiology