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There are two types of biorhythms. In science, a biorhythm refers to any "cyclic pattern of change in physiology or activity of a living organism." The study of these mechanisms is also known as chronobiology. This broad field of study includes long-term biological cycles such as migration instincts, menstruation cycles, and tidal rhythms in marine animals. Circadian rhythms, which control our sleep/wake patterns, are another form of scientific biorhythms. The second, more controversial definition of biorhythms refers to a theory of cyclic variations of human behavior. The idea is that factors like physical, emotional, and intellectual well-being are tied to a general cycle. If you're going through a good cycle, in theory you'll interact better with the world around you. So far none of these ideas have been supported by scientific evidence. A number of online resources cover biorhythms, including an extensive Wikipedia entry. For an opposing viewpoint, we suggest you consult Robert Carroll's Skeptic's Dictionary. And while we doubt too many classic gamers are interested
in the topic, those who are may want to pick up a copy of "Bases Loaded II" for the original Nintendo. The baseball game allows managers to keep an eye on their players' biorhythms, which translate into hot streaks and slumps.
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