The biorhythm theory is the pseudo-scientific idea that peoples' daily lives are significantly affected by rhythmic cycles with periods of exactly 23, 28 and 33 days, typically a 23-day physical cycle, a 28-day emotional cycle, and a 33-day intellectual cycle. So software was created in the 80's to help people track their cycles. Less amusing than horoscopes, more 3-color graphs! This one was published in Antic Magazine Volume 6 Number 09 in January 1988.
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