Dangerous truths
10 dangerously wrong beliefs—from lightning to antibiotics
Published on April 24, 2026
Image: Lucian Alexe
We all think we know how the world works, but many "common sense" beliefs are flat-out wrong. From everyday health myths to misunderstood science, these misconceptions can mislead you, waste your time, or even put you at risk. Here are 10 things you are dangerously wrong about, backed by real facts.
Lightning never strikes the same place twice
Image: Michał Mancewicz
Contrary to popular belief, lightning can strike the same place more than once. Since lightning often targets tall, conductive structures, multiple strikes to the same location are not uncommon.
For example, the Empire State Building is hit an average of 23 times per year. The myth persists because rare events seem unique, but statistics show that repeated strikes are common, especially in high-risk areas.
Antibiotics treat viruses
Image: Roberto Sorin
Antibiotics target bacteria, not viruses. Using them for colds or the flu is ineffective and promotes antibiotic resistance.
Prolonged misuse can lead to resistant bacterial strains, making future infections harder to treat. Correct diagnosis is critical for proper treatment.
Bulls hate red
Image: Gavia
Bulls are actually color-blind to red. Their reactions in bullfighting are triggered by the movement of the cape, not its color.
The bright red (and similarly striking colors) was likely chosen to make the cape more visible to the human audience from a distance, enhancing the spectacle.
Ice baths cure sore muscles
Image: Aman Krishna
Cold therapy offers temporary relief but doesn’t accelerate long-term muscle recovery. Overuse can impair adaptation to training.
Inflammation is part of muscle repair; blocking it too aggressively can reduce strength gains over time.
You need eight glasses of water a day
Image: Janosch Lino
Fluid needs vary by body size, activity, and climate. For some, eight glasses is excessive; for others, insufficient.
Relying strictly on this rule can cause dehydration or overhydration. Thirst and urine color are better indicators.
Sunburn isn’t harmful if it peels later
Image: Arturo Rivera
Even a single sunburn increases your lifetime risk of skin cancer, including melanoma. Peeling skin doesn’t undo DNA damage; it’s actually skin cells committing suicide to prevent the spread of harmful mutations.
Sunscreen, protective clothing, and shade are essential. Ignoring sun safety poses a serious health risk.
Don’t wake a sleepwalker
Image: Alexey Demidov
Waking a sleepwalker is safe. They may be disoriented or confused, but letting them roam unattended is far more dangerous.
The only real risk is injury from falls or collisions, not the act of waking them.
Natural sugar is harmless
Image: Myriam Zilles
Fructose in fruit is healthier than processed sugar, but overconsumption still strains the liver and metabolism.
Even "natural" sugars can contribute to obesity, insulin resistance, and diabetes if intake is excessive.
Hand sanitizer replaces washing hands
Image: Kelly Sikkema
Sanitizers can’t safely remove all pathogens, especially dirt and chemicals. Washing with soap and water is always more effective.
Over-reliance on sanitizers can actually increase infection risk, particularly during gastrointestinal or respiratory outbreaks.
Vinegar makes all cleaners better
Image: Precious Plastic Melbourne
Mixing vinegar with bleach, hydrogen peroxide, or other cleaners can create chlorine or peracetic acid fumes—both highly toxic.
Even small amounts can irritate eyes, lungs, and skin. Believing vinegar universally "boosts" cleaning power is dangerous; always read labels and avoid mixing chemicals.
