pseudoscience that turned your birthday into a permanent horoscope with graph paper.
means a debunked 1970s theory claiming physical, emotional, and intellectual cycles of fixed length (23, 28, 33 days) start at birth and predict your good and bad days forever.
from cooked up in the late 1800s by wilhelm fliess, a berlin doctor and friend of freud, then repackaged in the 1970s by swiss engineer george thommen into pocket calculators and paperbacks that sold millions of americans on plotting their own sine waves.
casio biolator — 1970s handheld calculator dedicated solely to biorhythm charts
george thommen — swiss-american who popularized it in the us via 1964 book
wilhelm fliess — 1890s berlin physician who first proposed the 23 and 28 day cycles
japanese bus companies — 1970s firms checked driver biorhythm charts before shifts