In the 1970s, some media outlets speculated that the Earth might be entering a new ice age due to short-term cooling trends and aerosol emissions. However, climate science has since evolved, and the overwhelming consensus now shows that human-induced global warming—primarily caused by greenhouse gas emissions—is the dominant trend. Evidence from NASA and the IPCC confirms that the current warming rate is unprecedented over millennia and directly linked to human activity.
The idea of a "sugar high" gained popularity in the 1970s but sugar does not cause hyperactivity in children. The relationship between sugar intake and behavior is complex and influenced by factors like blood sugar levels, genetics, and environmental factors.
While saturated and trans fats are harmful, research has clarified the benefits of monounsaturated and polyunsaturated fats (e.g., omega-3 fatty acids). These "good fats" help reduce inflammation, improve cholesterol levels, and support overall cardiovascular health.
Continental drift was initially proposed by Alfred Wegener in the early 20th century but lacked a mechanism for movement. By the 1960s, plate tectonics emerged as the accepted explanation, supported by seafloor spreading and magnetic striping evidence. By the 1980s, it became widely accepted in the scientific community as foundational geoscience.
Breastfeeding is now recognized as the optimal form of infant nutrition, offering immune protection, better developmental outcomes, and long-term health benefits for both infants and mothers. WHO guidelines highlight the importance of breastfeeding, especially exclusive breastfeeding for the first six months of life though formula is still vital for some families.
It was a common belief throughout history that the full moon influences human behavior.. The term "lunatic" is derived from the Latin word "luna" (moon), and the idea of werewolves and vampires being more active during the full moon is a common folklore. However, there is no scientific evidence to support this claim.
While the traditional five senses (sight, hearing, touch, taste, smell) are fundamental, modern science recognizes many more, including proprioception (sense of body position), nociception (pain), thermoception (temperature), and equilibrioception (balance), among others.
Life can spontaneously arise from non-living matter
What we know now
Experiments by Redi and Pasteur showed that life does not arise from non-living material under normal conditions. Sealed, sterilized environments develop no organisms unless exposed to existing microbes, which replaced spontaneous generation with the germ theory by the late 1800s.
Heavier objects fall faster than lighter objects in free fall
What we know now
Galileo and later experiments showed that in a vacuum all objects accelerate equally under gravity. In air, lighter objects may fall more slowly because of drag, not because weight alone determines acceleration.
Summer is warmer because Earth is closer to the Sun
What we know now
Seasons are caused by Earth's axial tilt, not distance to the Sun. When it is summer in the Northern Hemisphere, that hemisphere is tilted toward the Sun, making sunlight more direct and days longer.
Lightning is the electrical discharge, and thunder is the sound of air expanding after that discharge heats it. Thunder follows lightning; it is not a separate cause of it.
Human blood is always red. Deoxygenated blood is dark red, not blue. Veins can look blue through skin because of how light scatters in tissue, not because the blood itself changes color.
Cracking your knuckles causes arthritis later in life
What we know now
Clinical studies have found no meaningful link between habitual knuckle cracking and arthritis. The popping sound comes from gas bubbles in joint fluid, not from damaging the joints themselves.
Colds are caused by viruses, not by being chilled or having damp hair. Cold weather may keep people indoors together, but infection still requires exposure to a pathogen.
You must wait at least an hour after eating before swimming
What we know now
There is no good evidence that swimming right after a meal increases cramping or drowning risk. Digestion may divert some blood flow, but not enough to prevent normal swimming for healthy people.
Everyone should drink eight 8-ounce glasses of water per day
What we know now
There is no universal hydration rule that fits everyone. Most people can rely on thirst and normal food and beverage intake, because needs vary with activity, climate, and individual health.
Heat loss depends on exposed surface area, not a special rule for the head. The head only loses disproportionate heat when it is the main uncovered part of the body.
Eating a lot of carrots will give you excellent night vision
What we know now
Carrots provide vitamin A, which helps prevent deficiency-related vision problems, but they do not give healthy people superhuman night vision. The myth was amplified by World War II propaganda.
Educated people in the Middle Ages believed the Earth was flat
What we know now
Educated Europeans since antiquity generally understood Earth is spherical. The idea that medieval scholars believed in a flat Earth was popularized much later and does not match mainstream historical scholarship.
Distilled water is a poor conductor. Everyday water conducts because dissolved salts and minerals carry electrical current, not because pure H2O itself is conductive.
Bats are not blind. Many species see reasonably well and also use echolocation to navigate in darkness. The phrase "blind as a bat" is folklore, not biology.