The 2010s
10 myths from this era
Gluten panic, taste zones, and mobile phones are just a fad.
What you were taught
Brontosaurus is a real dinosaur species
What we know now
Brontosaurus was long treated as a misidentified Apatosaurus, but a 2015 reassessment argued that Brontosaurus is distinct enough to be recognized again as its own genus. The real myth is that the name was permanently invalidated.
Updated understanding emerged around 2015
What you were taught
Flu shots give you the flu
What we know now
A common misconception is that the flu shot can give you a mild case of the flu. This is false; flu vaccines contain inactivated viruses or only a single gene from the virus, which cannot cause the flu. Any symptoms experienced after vaccination are typically mild side effects, not the flu itself.
Updated understanding emerged around 2020
What you were taught
The Big Bang theory explains where the universe came from
What we know now
The Big Bang theory describes how the universe expanded from a very hot, dense state, but it does not explain what existed before the Big Bang or where the initial singularity came from. It describes the evolution of the universe, not its ultimate origin.
Updated understanding emerged around 2020
What you were taught
Most of the oxygen we breathe comes from trees
What we know now
While trees produce oxygen, the vast majority of the Earth's oxygen (estimated between 50-80%) is produced by marine phytoplankton through photosynthesis. This fact highlights the critical role of oceans in sustaining life on Earth.
Updated understanding emerged around 2020
What you were taught
Daddy Longlegs are the most venomous spiders but can't bite humans
What we know now
This is a persistent myth. "Daddy longlegs" can refer to harvestmen or cellar spiders, and neither supports the claim that they are the most venomous spiders on Earth but somehow cannot bite humans. The story is folklore, not settled zoology.
Updated understanding emerged around 2020
What you were taught
Pregnancy causes "baby brain" and makes women forgetful or less intelligent
What we know now
Research has not consistently found meaningful cognitive decline during pregnancy. Some studies suggest hormonal and organizational changes instead, and much of the "baby brain" reputation appears to be cultural stereotype rather than established neuroscience.
Updated understanding emerged around 2017
What you were taught
The hymen is a completely closed membrane broken by first intercourse
What we know now
The hymen is usually a thin, stretchy ring of tissue that does not fully seal the vaginal opening. It can change through many normal activities, and it is not a reliable indicator of sexual history or virginity.
Updated understanding emerged around 2015