“The full moon affects human behavior or causes more crime/accidents.”

The enduring notion that the full moon influences human behavior, leading to increases in crime or accidents, has deep historical roots. This belief can be traced back to ancient civilizations in Greece and Rome, where the moon was often associated with madness and erratic behavior. The very word "lunatic" itself derives from "luna," the Latin word for moon, reflecting a long-held conviction that lunar cycles could alter mental states. Philosophers like Aristotle and Pliny the Elder even theorized that the human brain, being largely composed of water, might be susceptible to the moon's gravitational pull in a manner similar to ocean tides. This idea was further propagated through folklore, literature, and even historical legal documents.

Despite this persistent cultural narrative, extensive scientific research has consistently debunked any link between the lunar cycle and human behavior. Numerous studies analyzing decades of data on crime rates, emergency room visits, hospital admissions for psychiatric conditions, and other markers of behavior have found no significant correlation with the phases of the moon. Scientists explain that while the moon's gravity is strong enough to affect large bodies of water, its influence on individual human bodies is infinitesimally small and insufficient to alter physiological or psychological functions. The overwhelming consensus from empirical evidence is that a "lunar effect" on human actions does not exist.

The reason this myth continues to thrive largely lies in a psychological phenomenon called confirmation bias. People who believe in the moon's influence tend to selectively notice and remember unusual or chaotic events that happen to occur during a full moon, while easily forgetting the countless full moons when nothing out of the ordinary transpired. This selective memory creates an "illusory correlation," where a connection is perceived even when there is no actual relationship. Anecdotal stories from professionals in fields like law enforcement or healthcare, who may also be influenced by this bias, further reinforce the misconception within popular culture.