Harmless Myths Everyone Still Believes That Science Has Totally Debunked
Some myths survive simply because correcting them seems unnecessary. For instance, believing that a goldfish forgets everything in three seconds isn’t harmful, so many people don’t bother to check. This harmlessness is why these myths have lasted so long despite being debunked by science.
The 10 Percent Brain Myth Traces Back to a Misread Study From Over a Century Ago
Brain imaging demonstrates that virtually every region of our brains is active at some point during the day. Neurologists, while studying simple tasks like clenching a fist, have confirmed this repeatedly. The myth likely originated from early neuroscience research, which was poorly understood, and it was enthusiastically adopted by self-help culture for motivational purposes.
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A Double-Blind Study Gave Kids Sugar-Free Drinks and Told Their Parents Otherwise
Parents who believed their children had consumed sugar rated them as noticeably more hyperactive, even when the drink contained none at all. Controlled studies have established no consistent link between sugar and hyperactive behavior in children; the association likely stems from sugar appearing disproportionately at parties and holidays, which are already full of excitement.
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One Man Cracked the Knuckles on Only One Hand, Every Single Day, for 60 Years
Dr. Donald Unger conducted this self-experiment to settle the question about whether knuckle-cracking leads to arthritis. After six decades, he found that both hands showed identical results—no arthritis in either hand—confirming that the popping sound comes from gas bubbles collapsing in joint fluid.
Image Credit: GlobalP / istockphoto.
Goldfish
Contrary to the belief that goldfish have a three-second memory, research has shown that they can retain information for up to three months, learning mazes, recognizing shapes and sounds, and remembering feeding schedules long after the moment should have slipped away.
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Bulls Can’t Actually See the Color That Supposedly Enrages Them
Cattle are dichromats, perceiving red as a shade of gray, not the fiery provocation assumed by bullfighting traditions. What actually grabs a bull’s attention is the movement, specifically the waving of the cape, rather than any particular color.
Image Credit: Renata Hamuda / iStockphoto
A Flawed 1950s Military Experiment Convinced Generations That Most Body Heat Escapes Through the Head
Researchers conducted tests with subjects insulated except for their heads, meaning that all measured heat loss would only show up there. In reality, the head accounts for just 7 to 10 percent of total body surface area and loses heat proportionately, just like any other exposed skin.
Image Credit: FabrikaCr / iStockphoto
The Bottom Line
These myths haven’t caused much damage by sitting unchallenged for decades. They simply outlived their expiration dates, repeated often by those who never questioned their origins.
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