New discoveries frequently challenge and reshape our understanding of the past and historical beliefs have paved the way for modern science to dispel myths and uncover truths.
Let’s illuminate how modern scholars have debunked long standing myths and provided a more accurate portrayal of historical events.
Flat Earth

Many ancient cultures believed that the Earth was flat. This view was based on immediate observations of the surrounding environment. It wasn’t until the Classical period that philosophers proposed the Earth was spherical.
Sun Revolves Around the Earth

Before the Copernican Revolution in the 16th century, it was widely accepted that the Earth was the center of the universe and that the sun revolved around it. This geocentric model was challenged by Copernicus, who argued that the Earth orbits the sun. His theory laid the groundwork for modern astronomy.
Spontaneous Generation

People once believed that living organisms could spontaneously arise from non-living matter. For instance, maggots were thought to be spontaneously generated from decaying meat. This belief was debunked by experiments conducted by Louis Pasteur in the 19th century.
Humorism

The ancient theory of humorism proposed that human health was governed by four bodily fluids: blood, phlegm, yellow bile, and black bile. Illness was thought to be the result of an imbalance among these fluids. This theory was central to medicine until advances in the 19th century proved otherwise.
Miasma Theory of Disease

The miasma theory posited that diseases such as cholera or the Black Death were caused by a “miasma,” or a noxious form of bad air. This theory was widely believed before the germ theory of disease was established. It led to public health efforts that, while misguided, did spur improvements in sanitation.
Phrenology

Phrenology was a pseudoscience that involved the measurement of bumps on the skull to predict mental traits. It was believed that certain brain areas corresponded to certain characteristics and that the skull would deform according to the development of these areas. Phrenology was discredited as neuroscience advanced.
Luminiferous Ether

Before the theory of relativity, scientists believed in the existence of an invisible medium called ether, through which light waves supposedly propagated. The Michelson-Morley experiment in 1887 provided strong evidence against this theory, paving the way for Einstein’s work. Ether’s theory was crucial to the development of physics despite its inaccuracies.
Alchemy

Alchemy was the medieval forerunner to chemistry, with practitioners believing they could transform base metals into noble metals, like gold. They also sought the elixir of life, a mythical potion granting immortality. Modern chemistry emerged when alchemists began applying experimental methods despite their mystical goals.
Witches Cause Misfortune

In medieval Europe, it was commonly believed that witches were responsible for various misfortunes, from failed crops to illnesses and even death. This led to witch hunts and trials that resulted in the execution of thousands of people, mostly women. These beliefs persisted until the Enlightenment began to challenge the superstitions.
Four Elements

Ancient philosophers believed that the world was composed of four fundamental elements: Earth, water, air, and fire. This theory influenced everything from medicine to alchemy. Modern science replaced this belief with the atomic theory and chemical elements.
The World on Turtle’s Back

Some Indigenous peoples, including certain Native American tribes, held creation myths that the world was supported on the back of a giant turtle. These stories were not taken literally but served as metaphysical explanations about the world’s nature. Such narratives provide rich insights into the cultural and spiritual lives of these communities.
Astrology Determines Fate

Astrology has been used to predict future events and personal traits based on the positions of stars, moons, and planets at the time of one’s birth. While still popular for entertainment, astrology as a science was largely abandoned after the scientific revolution. It showcases the human desire to find patterns and meaning in the cosmos.
Telegony

Telegony was the belief that all previous mates of a female could influence the characteristics of her future offspring. This idea was prevalent until the 19th century, when genetics provided a clearer understanding of inheritance. It reflects how reproductive biology was misinterpreted before modern genetics.
Curing Diseases with Bloodletting

Bloodletting was a common medical practice for over two millennia, based on the belief that it could cure illnesses by balancing bodily fluids. This practice persisted into the 19th century despite often being harmful. Advances in medical science eventually rendered it obsolete.
Tomatoes are Poisonous

In the 18th century, many Europeans believed tomatoes to be poisonous, largely because the plates they were eaten off of (made with lead) would leach toxins when acidic foods like tomatoes were placed on them. This misconception was cleared up in the 19th century when this interaction was better understood. Today, tomatoes are a staple in diets worldwide.
Mermaids Exist

Historical accounts and sailor’s tales often included sightings of mermaids. These were likely misidentified marine animals, such as manatees or seals. The myth of mermaids is a fascinating example of how maritime folklore can take hold.
Heavy Objects Fall Faster Than Lighter Ones

Before Galileo’s experiments, it was commonly believed that the rate at which an object fell was directly proportional to its weight. Galileo’s demonstration using the Leaning Tower of Pisa helped disprove this, showing that objects fall at the same rate regardless of their mass. This principle laid the groundwork for the study of classical mechanics.
Eating Carrots Improves Night Vision

The myth that eating large amounts of carrots improves night vision stems from World War II propaganda by the British to explain the effectiveness of their pilots’ night operations. This was actually to conceal their use of radar technologies. While carrots are high in vitamin A, which is good for eye health, they do not enhance night vision to such an extent.
Moon Affects Human Behavior

The belief that the phases of the moon affect human behavior, especially during a full moon, is known as the lunar effect. Despite its popularity, scientific studies have found no consistent evidence linking the moon’s phases to human behavior. This myth persists, showing how folklore can influence public perception.
Dragons Were Real

Dragons appear in the mythology of many cultures around the world. They were often thought to be real creatures that inhabited remote parts of the Earth. Modern science regards dragons as purely mythological, yet they continue to be a powerful symbol in popular culture.
Mountains Grow from Earth

Ancient cultures often believed that mountains grew from the Earth, much like plants. It wasn’t until the development of plate tectonics in the 20th century that we understood mountains are formed by the movement of the Earth’s crust. This geological process explains much about the Earth’s surface.
Leeches are Beneficial for Health

The use of leeches in medicine was based on the belief that they could cure everything from headaches to serious diseases by removing bad blood. Although largely discredited, leech therapy is still used in some modern medical treatments, showing that even outdated beliefs can hold a kernel of utility.
Sailing Too Far Leads to Falling Off Edge

During the Middle Ages, there was a common fear that sailing too far from land could lead one to fall off the edge of the world. This was based on the earlier flat Earth belief and was a significant concern for early explorers. The advent of global circumnavigation proved this fear unfounded.
Rain Follows the Plow

The “rain follows the plow” myth was a widely held belief in the 19th century among American settlers moving westward. They thought that cultivating the land would increase rainfall in arid regions. This myth was debunked as settlers encountered the harsh realities of the Great Plains.
Animal Sacrifices, Please Gods

In many ancient societies, it was believed that animal sacrifices could appease gods or influence spiritual forces. This practice was based on the belief in a direct connection between the spiritual actions of humans and the physical well-being of their communities. Modern perspectives on religion and ethics have largely moved away from such practices.