The word 'vertigo' derives from the Latin 'vertere,' meaning to turn

Vertigo is considered a subtype of dizziness

This two-minute video explains vertigo—a subtype of dizziness—and its many potential causes. It explores the vestibular system, the inner ear system, which typically governs our sense of stability, and details its anatomy.

Dizziness may describe lightheadedness and imbalance, not the spinning of vertigo

Dizziness is defined as an altered sense of spatial orientation, and may include feeling like you might fall over. Vertigo is associated with feeling like you are spinning or your surroundings are spinning.

Vertigo is a mismatch of information between the eyes and the ears

Both vertigo and motion sickness can be caused by mismatches between visual and auditory inputs.The brain relies on inputs from the eyes, inner ear, and receptors in muscles and joints to orient the body. When the eyes suggest movement but other signals suggest the body is stationary dizziness and nausea can occur.

Vertigo is two to three times more common in women than men

Dizziness, including vertigo, occurs among 15% to 20% of adults. Vertigo can have numerous causes, but generally it's more common with age. It's also much more common among women than in men—occuring roughly two to three times more frequently, sometimes potentially related to the hormonal fluctuations of menopause or to migraines.

Vertigo can last for minutes—or months—and may occur periodically

Vertigo can be caused by a variety of conditions, including as a side effect of medication, but if it comes on suddenly and is accompanied by other symptoms including difficulty with speech or weakness on one side of the body it's important to go to the emergency room to get checked for a stroke. For recurring vertigo, care teams can teach patients exercises to limit panic, lessen nausea and teach the brain to better tolerate head movements.

Studying involuntary, rapid eye movements is a key part of vertigo diagnosis

A doctor will look at a vertigo patient's rapid, uncontrollable eye movements—formally called nystagmus—to better understand its causes. When a patient is lying down with their head turned and their eyes spin in a certain position and stop it's likely a peripheral cause, but if the spinning doesn't stop or it changes direction it's more likely a central nervous system issue.

Ménière's disease is a long-term, inner ear disorder that causes vertigo

This severe vertigo-causing disorder may involve long and recurrent episodes of vertigo. Symptoms of this disease include balance issues and hearing loss, tinnitus, and a feeling of fullness in the ear. It typically affects only one ear and is linked to a buildup of excess fluid in the inner ear.

A BPPV patient describes how a neck massage fueled crippling vertigo

The pressure, she says, dislodged tiny crystals in her inner ear that are crucial to balance. The condition is called benign paroxysmal positional vertigo, or BPPV.

Tinnitus is derived from the Latin verb tinnire, meaning to ring

Read the entry in The Physical Dictionary by Stephen Blankaart, from 1693, where the word first appeared in English.

Zero-g rides get their name from the weightless sensation of being turned upside down

Inversions are when riders are flipped upside down on rides. Zero-g rolls involve turning 360 degrees with inversions, resulting in a temporary experience of zero g-force for passengers.

Poliomyelitis is derived from Greek

Polio, formally called poliomyelitis, comes from the Greek words for gray (polios) and marrow (myelos)—a reference to the spinal cord tissue that, when infected by the virus, causes paralysis.

The word 'influenza' comes from a 15th-century Italian belief in the stars

In Renaissance Italy, epidemics were thought to result from the influence of natural disasters or celestial bodies. The illness was named "influenza", meaning “influence” in Italian.

'Melancholia' was the ancient Greek term for depression

"Melancholia" in Hippocrates's time was derived from the Greek word for black bile. This term made sense in its context since the Greeks believed that depression stemmed from an improper balance of the four humors.

Wind is the movement of air caused by the sun's uneven heating of Earth

The tilt, curvature, and variations in Earth's surface composition across the globe cause different regions to receive different amounts of solar radiation. As the Earth spins and tries to achieve thermal equilibrium, air masses move and interact, creating wind.

Voir dire is the process that determines who actually sits on a jury

Meaning "to speak the truth" in French, voir dire is the questioning of prospective jurors by a judge or attorney to assess their impartiality and suitability for service. Those deemed unfit are excused before a final jury is seated.

Why do some people always get lost?

Using GPS, anthropological data, and VR, scientists have learned that one's sense of direction is largely influenced by upbringing. A person's wayfinding ability can be measured by how accurately they point toward an out-of-sight location, a challenge further complicated by imagining they're somewhere else and pointing toward a third location. Anxiety, safety concerns, and dislike of wandering can negatively impact one's sense of direction, which can improve with practice.

The word 'restaurant' comes from the Latin for 'restore'

Many believe the word came into use thanks to Boulanger, an 18th-century Parisian soup vendor. According to legend, his shop claimed it served "bouillons restaurants," or "restorative broths."

An overview of Venus, from its retrograde rotation to its volcanic surface

Boasting over 1,600 major volcanoes—more than any other planet in the solar system—Venus rotates in the opposite direction as Earth, potentially due to a major collision during its formation that flipped the planet upside-down. The planet's rotation also makes days on Venus last longer than its entire year.

'Dystopia' is an inversion of Sir Thomas More's 'utopia'

The word is derived from the Greek for “bad place," but it's also an inversion of “utopia,” a term popularized by Sir Thomas More in his 1516 book, "Utopia," which imagined an ideal society free of oppression, inequity, and want. More recognized this place was a fantasy; "utopia" is derived from the Greek for "no place."

The word 'Earth' comes from the German root word for 'ground'

In English, "Earth" means the planet and the land, but many languages identify each with distinct words. Earth is often given a maternal name or one that identifies it as the land of the living.

Schizophrenia literally means 'split mind'—a reference to patients' break with reality

Contrary to the name, patients do not have multiple personalities. Rather, the split mind refers to the sufferers' inability to distinguish reality from hallucinations when they are aware and awake. Cognitive difficulties, including challenges focusing and communicating are also common among those with schizophrenia, as well as auditory and visual hallucinations.

One doctor argued vampires were based on a real disease

At a conference in 1985, Canadian biochemist David H. Dolphin posited that stories of vampires and werewolves had a real-world origin. He argued that porphyria could have caused sufferers to seek out blood, as well as experience light sensitivity and an aversion to garlic. More than one article in the 1990s discredited this take.

The word 'jazz' evolved from 'jasm,' 19th-century American slang for 'energy'

What it means to call a bracket 'chalk'

If the tournament is rather boring, you might hear a curious word getting thrown around: "chalk." In short, it means that the favorites have been winning. The word's origins go back to horse racing and its sportsbooks, where bookies would post odds on chalkboards. Over time, the bookies came to be known as "chalk" and, years later, tournaments (and their brackets) that seemed to favor those bookies earned the name, too.

The true origins of the Western tumbleweed

Tumbleweeds are iconic features of classic American westerns, seen blowing across a desert landscape as a cowboy walks into town. But this species isn't native to the US Southwest. In fact, it was unintentionally imported from Russia. As farmers loosened the ground in the West, they created the perfect breeding ground for the Russian thistle tumbleweed to flourish there. Watch more on its history here.

After 25 people used virtual reality headsets to practice flying with virtual wings—flapping their arms—their visual cortex responded to the wings almost as if they were real arms, treating them as body parts.

Hurricanes, which rely on air consistently spinning in the same direction, cannot cross the equator because air curves in opposite directions north and south of it.

What is Freud's idea of the unconscious?

The unconscious has become a widely used term, but Freud meant something quite specific. Here's a look into his technical use of the term.

Ebola is a filovirus, meaning it resembles a thread under a microscope, though it sometimes twists and can resemble a bowl of spaghetti.

The Dracula character, now seen as the vampire archetype, was inspired by a seafood-induced nightmare its creator experienced.

Venture capital is a form of funding provided to early-stage companies with high growth potential, typically in exchange for an equity (or ownership) stake

Apeirophobia is an overwhelming fear of living forever, perhaps stemming from the brain's inability to conceptualize an infinite life.

Explore chaos in this simulation of two double pendulums, where small differences in the release angles produce wildly different outcomes.

Stars appear to twinkle because turbulence in the motion of molecules in Earth's atmosphere causes light to bend and wiggle rapidly on its way to the surface—a phenomenon called scintillation.

The hormonal disorder PCOS was renamed PMOS in 2026, a move designed to improve care and research by shifting the focus to the hormonal causes of this condition that affects 1 in 8 women.

El Niño, Spanish for 'the boy,' was named after Jesus Christ because the phenomenon resembled the weather changes observed around Christmastime.

Alzheimer's can lead to brain shrinkage, with an average of around 2% of volume reduction per year

Volcanoes 'die' when their supply of magma runs out, if they are shifted away from their underlying magma reservoir, or if they get clogged by collapsing or their magma cooling back into rock.

Some Pokémon have been named after real and fictional organisms, while some real-world species have been named after Pokémon, such as Chilicola charizard and Binburrum zapdos.

Clever Hans was a 1900s horse that was believed to be able to solve math equations, tell time, and read and comprehend German, until a psychology student discovered how he got his answers.

A century of Billboard issues documenting the evolution of popular music.

During the French Revolution, a botanist's letter asking about "dear Rhus" (poison ivy) was intercepted, leading authorities to suspect he was conspiring with the Russians.

Long before Major League Baseball began allowing instant replay for balls and strikes, an umpire reluctantly used the technology to determine whether a hit was a home run, a move that inadvertently ushered in a new era for the sport.

Power lines are dotted with large, brightly colored balls to improve the visibility of these thin wires to helicopters and small planes and help prevent potential crashes.

Brian Wilson wrote the Beach Boys' 'Don't Worry Baby' for the Ronettes, but the legendary girl group rejected it.

Most of the observable universe's volume consists of voids and supervoids—enormous regions of space with little to no galaxies, stars, or light.

The original copy of the Declaration of Independence is not a pristine document, and even features a smudged anonymous handprint in the bottom left corner.

Gerrymandering works through two techniques: cracking opposing voters across districts to dilute their power, and packing them into a few to waste their votes in lopsided majorities.

See a 3D reconstruction of Tenochtitlan, the Aztec capital that was home to an estimated population of 200,000 to 400,000.

See photos of Meteora, a mountainous site in central Greece, home to 14th-century monasteries perched atop soaring outcroppings.