Biorhythm (sometimes spelled bio-rhythm) is usually defined as a system of three major cycles beginning at birth. This is a physical cycle of 23 days, an emotional cycle of 28 days, and an intellectual cycle of 33 days. These cycles have been shown to affect patterns of behavior. There are excellent books that give the history of biorhythm, teach you how to make your own biorhythm chart and tell you what to expect on certain days, as indicated by your chart (see Recommended Sites, Books, Et cetera Page). (To receive a 12-month biorhythm chart from Irene, see either of the two order pages or the order form on the back of an issue of the MiniExaminer.) IHS-Biorhythm uses these same three cycles, but relies on the discoveries of Irene Hamlen Stephenson which enable her (or you if you buy her courses) to construct a character analysis for someone born on that day (calendar dates have biorhythm signatures) and to determine the compatibility of that person with someone else whose date of bir