Working with the limited scientific knowledge they had, the ancient Greek and Roman civilizations cooked up a handful of theories about the human body. While a few hit the mark, most missed spectacularly. In this roundup of 10 incorrect ancient ideas, we’ll see how doctors, philosophers, and curious minds got hilariously wrong.

10 Incorrect Ancient Theories About the Body

10 Food Was Changed Into Blood By The Liver

Galen, arguably the most celebrated Roman‑era physician (though of Greek descent), penned countless treatises on anatomy and physiology. Among his many correct observations, he also championed the notion that food, after being broken down in the stomach, traveled to the liver where it was magically transformed into blood. This error stemmed largely from the fact that human dissection was forbidden in his time, leaving him to infer from animal work. Galen’s teachings dominated medical curricula for centuries, persisting unquestioned until the 16th‑century anatomist Andreas Vesalius began to challenge his authority.

9 Lambs Grew From Trees

Megasthenes, a Greek explorer who returned from India with a vivid travelogue, described cotton plants as “trees on which grew wool.” Misreading this, later scholars assumed that actual lambs sprouted from branches. This fantastical idea spread through the works of Theophrastus and Pliny the Elder, who both mentioned ‘wool‑bearing trees.’ The myth lingered well into the 1700s and 1800s, inspiring books and even expeditions seeking the elusive plant that supposedly bore lambs.

8 Light Came From The Eye

Plato, one of the towering philosophers of antiquity, ventured into optics with a bold claim: a stream of light or fire emanated from the eye, struck objects, and then merged with sunlight to produce sight. He further argued that colors were merely “flame particles” shed by objects. This view held sway until the 11th century, when the Persian scholar Ibn al‑Haytham demonstrated in his Book of Optics that the eye functions as a passive receptor, not a light emitter.

7 Veins Carried Blood, Arteries Carried Air

Praxagoras, an early Greek physician whose works have not survived, is credited with distinguishing veins from arteries for the first time. Yet he insisted that arteries conveyed air, not blood, reasoning that blood leaked from arteries after death while air filled them. He explained bleeding by suggesting that exposed arteries attracted blood from surrounding tissue when in contact with air. This misconception persisted for many centuries.

6 Sleep Occurs When Blood Flows Away From The Surface

Alcmaeon of Croton, a pioneering Greek thinker who first argued that the brain, not the heart, was the seat of intellect, also proposed that sleep arose when blood retreated from the body’s surface to deeper vessels. He further claimed that death ensued if all blood sank inward. While his insights into brain function were groundbreaking, his circulatory theory missed the mark.

5 The Brain Was Just A Cooling Device

Aristotle, the legendary philosopher‑scientist, placed the heart at the center of cognition and sensation, relegating the brain to a mere cooling organ for the heart and a repository for ‘spirit.’ He dismissed earlier neuro‑centric ideas from Plato and Alcmaeon as fallacious, and even asserted that women’s brains were smaller than men’s—a claim that lingered for centuries.

4 Hemorrhoids Could Be Cured In Weird Ways

Pliny the Elder, author of the encyclopedic Naturalis Historia, recorded a bewildering array of remedies for hemorrhoids. Treatments ranged from inserting an onion as a suppository to consuming garlic with wine only to vomit it back out. Another prescription involved rubbing fresh rosemary root on the afflicted area, while a particularly odd cure mixed pig lard with rust scraped from a chariot wheel.

3 Light Traveled Through The Ether

Aristotle also posited that the cosmos was suffused with an invisible substance he called ‘ether,’ arguing that light could not traverse a true vacuum. This ether theory endured for over two millennia, only being dismantled in 1910 when Albert Einstein’s special relativity showed that light propagates without any medium.

2 The Testicles Determined A Person’s Voice

Aristotle further claimed that the testicles dictated vocal pitch, observing that boys’ voices deepened as their testicles descended during puberty. He noted that castrated males retained a higher, “ladylike” timbre, extrapolating that the testes must control voice. Modern anatomy, however, places the larynx and its vocal folds at the heart of pitch regulation.

1 The Womb Roamed Around A Woman’s Body

Hippocrates, hailed as the father of Western medicine, championed the humoral theory of four bodily fluids, yet his most outlandish belief was the ‘wandering womb.’ He argued that a woman’s uterus craved warmth and moisture, and if she abstained from sexual activity, the organ would become bored and drift throughout her body, causing a host of ailments, including hysteria. This notion persisted well into the Middle Ages.

The TV series All in the Family ran on CBS from 1971 to 1979. In this classic, the unforgettable Archie Bunker—played by Carroll O’Connor—spouts a barrage of opinions that still raise eyebrows. Below are the 10 archie bunker moments that showcase his most politically incorrect commentary.

10 Archie Bunker On Equal Rights For Women

When neighbor Irene Lorenzo vents that she’s being paid less than the men doing the exact same job, Archie jumps in with his trademark, outdated logic. He declares that men are somehow intrinsically more valuable than women, backing his claim with a twisted biblical quote: “God made man in his own image, then fashioned women from a cheaper cut.”

Learning that Irene’s hourly wage—$5.50—is identical to his own throws Archie into a tizzy. He declares equality “unfair” and asks, “What’s the point of a man toiling his whole life if he ends up on the same level as a woman?”

9 Archie Bunker On Racial Equality

Archie balks at the Jeffersons, a Black family, moving into his block, and Gloria and Mike label him “crooked” for his stance. He retorts that he’s merely looking out for “Number One,” which, in his mind, makes Mr. Jefferson “Number Two.”

Gloria fires back, asking whether Puerto Ricans are “Number Three,” prompting Archie to launch into a bewildering hierarchy: “Puerto Ricans could be Four, your Japs and your Chinks could be Three… 3A, 3B.” His baffling list underscores his inability to see beyond his own prejudice.

8 Archie Bunker On Vegetarianism

When meat prices spike by eight percent, Gloria suggests the family go vegetarian to save money and improve health. Archie erupts, insisting that eating meat is “natural” and that humanity was put on Earth for that purpose.

Mike challenges the claim, and Archie pulls out the Bible, insisting ancient peoples ate meat and only later discovered that apples were a mistake. He jokes about special‑occasion meals of goats and lambs, asking, “Who’s ever heard of sacrificing a head of lettuce?”

7 Archie Bunker On The American Melting Pot

In yet another clash with Mike and Gloria, Archie delivers his version of American history, painting Lady Liberty as a megaphone shouting, “Send me your poor, your deadbeats, your filthy…” He then lists the waves of immigrants—Spanish P.R.s, Japs, Chinamen, Krauts, Hebes, and English fags—who, according to him, settle in separate “sections” and will “bust your head” if you wander into theirs.

Archie declares this segregation the very thing that makes America great, wrapping his rant in a bizarre mix of patriotism and xenophobia.

6 Archie Bunker On Slavery

Archie muses, “If God wanted us all together, He’d have put us together. But He put you over in Africa and the rest of us in the white countries.” He then jokes that someone must have told God where to place people, because “free transportation, room, board, chains” sounded like a good deal.

Sammy chimes in, tongue‑in‑cheek, noting that slavery offered “work, room, board, chains,” to which Archie insists he was “dead‑set against slavery” all along.

Mike, Gloria, and Lionel Jefferson respond by belting out “The Battle Hymn of the Republic,” turning Archie’s twisted logic into a punchline about misreading history.

5 Archie Bunker On Gun Control

Mike confronts Archie about giving his son Joey a toy gun for his birthday. Archie proudly defends it as a First Amendment right, confusing free speech with the right to bear arms.

When Mike corrects him—”The First Amendment is free speech”—Archie doubles down: “Exactly! When you have a machine gun in your hand, you have the right to say whatever you want!”

Archie even appears on local TV, proposing that arming every airline passenger would end skyjacking. He imagines handing pistols to travelers at boarding, then collecting them at the end, declaring the problem “Case Closed.”

4 Archie Bunker On Cavemen

While competing with Irene for a job, Archie argues that women were “created for two things: making meals and babies,” citing cave women’s short legs and fat butts as evidence they couldn’t run fast, so men could catch them. When Mike probes about cave men with short legs, Archie retorts they were probably “your first fags,” ending the absurd debate with a sigh.

3 Archie Bunker On Evolution

Mike calls the Creation story a “fairy tale,” prompting Archie to slam the Bible open and proclaim, “There it is, in black and white. We didn’t crawl out of rocks, we didn’t have tails, and we certainly didn’t evolve from monkeys, you atheistic pinko meathead.”

2 Archie Bunker On Black Athletes

During a meal, Archie reflects on baseball’s evolution, noting 1947 as the year Jackie Robinson entered the majors, which he claims “threw the whole game out of balance.” He frames it as a shift caused by the “inferior black race” entering the sport.

Mike pushes back, demanding clarification. Gloria tries to calm the tension, but Archie insists the “coloreds” run faster, jump higher, and bruise less because of their “jungle heritage,” suggesting they’re especially suited for night games.

Mike finally says, “You know something, Mr. Bunker? I thought I misjudged you, and I was right—you’re a lot more ignorant than I thought.”

1 Archie Bunker On Opinions

At their first meeting, Archie and Mike clash over Vietnam‑war protests. Archie launches into a tirade, calling Mike a “meathead… dead from the neck up,” then declares that free speech means he can say whatever he wants, while anyone who disagrees gets jailed or labeled a meathead.

Mike interprets this as Archie’s twisted version of liberty: you can speak freely, but only if your voice aligns with his. Anyone else is silenced or insulted.

The exchange mirrors today’s climate—people demand the right to voice opinions but often refuse to hear opposing views, making genuine conversation impossible.