The 1990s
11 myths from this era
Pluto is a planet, the brain has halves, and the internet is for academics.
What you were taught
Left-brained people are logical, right-brained people are creative
What we know now
Brain imaging shows both hemispheres work together for most cognitive functions, and the left/right brain divide is oversimplified.
Updated understanding emerged around 2013
What you were taught
Dinosaurs died only from a volcano
What we know now
While volcanic activity was present, the prevailing scientific consensus is that the extinction of non-avian dinosaurs was primarily caused by the impact of a large asteroid (Chicxulub impactor) about 66 million years ago, which led to widespread environmental devastation.
Updated understanding emerged around 2000
What you were taught
The Great Wall of China is visible from space
What we know now
This popular myth, often taught in schools, is false. While the Great Wall is an immense structure, it is too narrow and blends too well with its surroundings to be visible to the naked eye from Earth orbit or the Moon. Other man-made structures, like major highways or cities, are more easily discernible.
Updated understanding emerged around 2000
What you were taught
Reading in dim light ruins your eyesight
What we know now
The human eye is designed to adapt to different lighting conditions. While reading in dim light can cause temporary eye strain, it does not cause lasting damage to your vision, a fact widely accepted and publicized by the early 2000s.
Updated understanding emerged around 2000
What you were taught
The tongue has distinct regions only for sweet, salty, sour, and bitter tastes
What we know now
The classic tongue taste map is a myth based on a mistranslation of old research. Taste receptors for sweet, salty, sour, bitter, and umami are distributed across the tongue and mouth.
Updated understanding emerged around 1974
What you were taught
Each gene encodes exactly one protein
What we know now
Genes can produce multiple proteins through alternative splicing and regulation, and many genes do not code for proteins at all. The one-gene-one-protein rule was an early simplification that modern genetics has outgrown.
Updated understanding emerged around 1985
What you were taught
All the cells in the human body are replaced every seven years
What we know now
Cell turnover varies widely by tissue. Some cells renew in days, while neurons and lens cells can last a lifetime. The seven-year figure is a rough average, not a universal replacement schedule.
Updated understanding emerged around 2005
What you were taught
Natural blond and red hair are going extinct in the global population
What we know now
Hair color is controlled by recessive genes that can persist hidden in carriers for generations. Population genetics does not support claims that blond or red hair is disappearing from humanity.
Updated understanding emerged around 2007
What you were taught
Viruses are alive just like tiny organisms
What we know now
Viruses lack independent metabolism and cannot replicate outside a host cell. Most virologists treat them as non-living infectious particles that hijack cellular machinery rather than as fully alive organisms.
Updated understanding emerged around 1990