I don?t know if there are any left today. Late-19th-century biorhythm theory, which got another 15 seconds of fame in the 1970s, is the pseudoscientific idea that people’s daily lives are significantly affected by rhythmic cycles with periods. There is a 23-day physical cycle, a 28-day emotional cycle, and a 33-day intellectual cycle. In the […] Visit #TBT Plan Your Life With The Certina Biostar to read the full article.

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