Trig graphs - how do you feel today?
By Murray Bourne, 22 Apr 2007
Biorhythms are interesting. There is no science involved, and they should not be taken seriously.
I have added a section in the math site called Biorhythm Graphs. It contains an interactive graph where you can enter your own, or anyone's, birthday and see their biorhythm profile. Check it out.
Biorhythms are interesting because they are examples of trigonometric curves with different periods.
For a skeptical analysis of biorhythm theory, see Skeptik's Dictionary.
See the 4 Comments below.