Dangerous truths

10 dangerously wrong beliefs—from lightning to antibiotics

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

The universal language

From "mama" to "banana": Words that are understood in every language

Learning languages is hard. But, fortunately, some terms rooted in daily universal experiences don't change much when crossing borders. If you say "mama, "papa," "taxi," or "banana," anywhere in the world, they’ll recognize those nouns immediately —even if the context provided is entirely blurry. The question is: Why did these words barely change over time and across different languages? Let’s explore the stories behind the most spoken words on the planet.

"OK" is the most spoken word on the planet. And it started as a typo joke. In 1839, the initials "O.K." were first published in the Boston Morning Post, meant as an abbreviation for "oll korrect" — a popular slang misspelling of "all correct."

Following that gag, politics intervened. In 1840, President Martin Van Buren's reelection supporters formed "O.K. Clubs" across the country, since Van Buren was nicknamed "Old Kinderhook" after his hometown in upstate New York. From there, telegraphs carried it coast to coast, and eventually it spread from North America all the way to the Moon, where Buzz Aldrin spoke it after the Apollo 11 landing.

Is it a real word? According to science, it is. In 2013, researchers at the Max Planck Institute for Psycholinguistics investigated "huh?" in naturally occurring conversations across ten languages and presented evidence for two claims. One, the term is universal. Two, it is genuinely a word.

They later expanded the study to 31 spoken languages from around the world and found that all of them have a word with a nearly identical sound and function as the English "huh?" With all its nuances and differences, most human languages on Earth independently arrived at similar rising syllables for not understanding something in conversation.

Why do unrelated languages, spoken by people who never met, use almost identical words for "mother" and "father"? In Swahili: mama. In Polish: mama. In Mandarin Chinese: māma. In Quechua, spoken in the Andes of South America: mama. This mystery puzzled linguists for generations.

This isn’t a case of cognates (words borrowed from one language to another). The answer here lies in babies: "mama" and "papa" are among the easiest sounds to produce, because they combine bilabial consonants and open vowels. "Mmm" is often the first consonant babies experiment with.

The term "hello" had floated around English since the 1820s, mainly as a shout to get someone’s attention, like "hey" or "oi." But it was barely more than that before telephones existed.

Then, in 1876, Alexander Graham Bell invented the telephone, and it was time to decide what callers should say when they picked up. Bell himself suggested the traditional nautical hail, "Ahoy." It was Thomas Edison who suggested "Hello!" in a letter dated 1877. By 1889, telephone operators had become widely known as "hello-girls." By then, the greeting had jumped to everyday conversation, and eventually every language on Earth picked up a version of it.

It is said that "Coca-Cola" is one of the most recognizable terms on the entire planet, much like the word "OK." This makes sense: the soft drink is sold in more than 200 countries. The name wasn’t the result of a marketing team or a focus group. It was coined in 1886 by the company’s bookkeeper, Frank M. Robinson, who derived it from the drink's two original ingredients: coca leaf and kola nut.

The drink was invented in Atlanta, Georgia, in 1886 by Dr. John S. Pemberton, who originally marketed it as a medicinal tonic. Today, approximately 1.9 billion servings of Coca-Cola beverages are consumed each day, so wherever in the world you are, the brand needs absolutely no introduction.

The word "coffee" has traveled far. Its story starts in the Ethiopian highlands with a by-now popular legend that depicts a 9th-century goat herder who noticed his goats wouldn’t sleep after eating berries from a certain bush. Thus, the idea of the drink made from those berries spread in Ethiopia.

From there, it moved to Yemen, where it was documented in a 15th-century text as a drink made from roasted coffee beans. It was assigned the Arabic word qahwa, which traveled with the drink. The product was traded by the Ottomans, who influenced several other languages, and from it derived the Italian caffè, the Dutch koffie, and the French café. So, the term has mutated slightly in each language, but it remains similar enough to identify it easily all over the world.

Every night, hundreds of millions of people all over the world put on a Persian garment with a Persian name. The word "pajamas" comes from the Persian pay-jāma, a compound of pay (foot or leg) and jāma (garment). In 15th-century Persia, it referred to loose trousers worn by men and women for comfort, and the term entered English in the 18th century when British colonists encountered the garment in India.

But the original pajamas were not sleepwear for a long time. Victorian high society adopted them as fashionable, exotic loungewear, and it was by the early 20th century that the two-piece sleeping suit had spread across the Western world. Today, most countries in the world have very similar names for this garment.

"Safari" is the name for a very specific activity. For many tongues in the world, the word itself conjures jeeps, binoculars, lions, and zebras.

But its original meaning was distant from the current one. It comes from the Arabic safara, which means "to travel." In Swahili, safari simply means any kind of journey, not just a wildlife expedition. For the English language, it was first recorded by explorer Sir Richard Francis Burton in the Journal of the Royal Geographical Society in 1859. British colonists in East Africa understood the word to apply to hunting expeditions, and, by the middle of the 20th century, Hollywood had cemented its modern image with films romanticizing the African bush.

Today, Apple’s decision to name its search engine "Safari" brings the term closer to its original meaning than to the one related to wildlife exploration.

Banana is one of the most consumed fruits on Earth, and its name has traveled with it. The word "banana" first appeared in English in the 1590s, borrowed by Spanish or Portuguese explorers from a West African word, possibly from the Wolof language, spoken in what is today Senegal and Gambia.

Most historians sustain that Africans began harvesting the fruit at least 4,500 years ago. When Portuguese and Spanish ships began trading across the world in the 15th and 16th centuries, they encountered the fruit, borrowed its African name, and carried both across the Atlantic. Today, the word sounds remarkably similar in many languages: banana in English, Spanish, Italian, and German; banane in French; 바나나 (banana) in Korean.

From Buenos Aires to Bangkok, you can step off a plane having never spoken a word of the local language, hold out your hand, and say one word: "Taxi." You will get the exact same thing. But the story of this two-syllable word is a tangle of countries and languages.

The original word was "taximeter," coined by German inventor Friedrich W. G. Bruhn in 1891. This was a device that measured the fare by distance. It was the French who shortened taximètre to taxi. A company imported them to New York under the market name "Taxicab" and decided to paint them yellow, since it was the most visible color. From there, both the short name and the iconic color stuck. Today, it is a symbol universally shared that you’ll find in every major city.