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The Sandia findings may well inject new vitality into the old theory of biorhythm, which flatly contends that the times at which physical prowess, sensuality and braininess reach maximums and minimums can be pinpointed throughout life. Although there has been no rational explanation so far for the claims of biorhythmicists, variations of the concept have been put to practical use in at least two countries. The Swiss have devised a pocket calculator* that when individually set will show the owner's "off" days —when he is accident prone, forgetful or in low spirits.
In Japan, the Ohmi Railway Co. has stored in a computer the biorhythms of each of its 500 bus drivers. At the beginning of each shift, drivers scheduled to have "bad" days are given a card reminding them to be extra careful. In their first biorhythmic year, 1969, Ohmi's drivers achieved a 50% drop in accidents, a downward trend that continued last year.
* Based on scientifically unproven 23-, 28-and 33-day biological cycles.