Lately I've been studying Biorhythms to determine how compatible two people are. Biorhythms are a step up from zodiac compatibility in that it's a scientific equation. Some argue that its not accurate, however a lot of people trust it, it was used to determine Michael Jackson's date of death, and in my studying Biorhythms I've found that they line up with people I've dated in the past as well as other people's romantic relationships. To test the compatibility of you and your mates Biorhythms click this link: https://keisan.casio.com/exec/system/1340247198 You can also use a person's individual Biorhythm to determine their mind set on any given day to get insight on how to properly deal with them. The hypothesis about Biorhythms on Wikepedia states: The theory was developed by Wilhelm Fliess in the late 19th century, and was popularized in the United States in late 1970s. Basic rhythm details Physical cycle 23 days; Circavigintan coordination strength ...