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When reflecting on ancient history, we often envision outdated ideas, bizarre scientific theories, and perhaps even the pyramids. However, there have been numerous instances where the ancients were spot on with their insights.
From the theory of evolution to the concept of the big bang, many groundbreaking ideas in modern science can be traced back to thinkers who lived over 2,000 years ago. Despite lacking the advanced technology, knowledge, and experimental tools we have today, they managed to get a surprising number of things right. In a way.
Here are 10 instances where ancient wisdom turned out to be remarkably accurate.
10. The Concept of Atoms
In the 5th century BC, a Greek thinker named Leucippus proposed a remarkable idea: Everything in the visible universe is made up of tiny, indivisible particles. This school of thought, embraced by the famous philosopher Democritus, became known as Atomism.
They argued that all matter was composed of countless tiny components, which they named “atoms.” (The original Greek word atomos means “uncuttable.”) They also believed that different types of atoms created different substances. Strong materials like iron were made of robust atoms, while water was composed of slippery ones.
This concept of fundamental, minuscule particles forming everything in existence also appeared in India in the 6th century BC. During this time, the three major religions—Buddhism, Jainism, and Hinduism—offered varying ideas on how these atoms interacted with the world and what they constituted. Yet, all of them shared the belief that these basic particles existed.
After Aristotle gained influence in the philosophical realm, his rejection of atomism caused the concept to be largely forgotten. It wasn’t until 1905, when a 26-year-old clerk named Albert Einstein proved the existence of atoms, that the idea was revived.
9. Thermodynamics
One ancient philosopher who is often overlooked is Heraclitus. This is made easier by the fact that only 100 fragments of his works have survived. Still, his fame endures due to the complexity of interpreting his ideas.
His entire philosophy is based on a monistic view that fire represents the true nature of reality: Everything in existence is governed and created by fire. In fragment 30b, this is clearly expressed when he refers to the cosmos as an “ever-living fire.”
While the idea that everything in the universe is made of fire is not entirely accurate (we’d certainly notice if that were the case), Heraclitus' theory is closer to the truth than it seems at first glance.
The laws of thermodynamics are what keep the universe functioning. Without heat, nothing would occur. Heat is a form of energy that drives transformation and change, and it is transformation and change that sustain the cosmic cycle of creation and destruction. Although not all matter is composed of fire, fire and heat are essential in maintaining life and preventing the universe from collapsing in on itself.
8. Flux
Heraclitus is also famous for another piece of wisdom, likely his most well-known: “All is in flux.” It may sound odd: Everything is in a perpetual state of motion and change, meaning we can never “step in the same river twice.”
For Heraclitus, the only true constant in life, the universe, and everything is change.
To the human eye, this may not seem accurate. If you observe your keyboard, it doesn’t constantly shift and change in a state of endless flux. Life would be incredibly difficult if it did. As a result, some interpretations suggest that he was referencing a more abstract concept rather than describing the tangible world.
Yet, quantum mechanics presents a vastly different perspective. According to quantum field theory, everything in the universe is made up of minuscule particles that are continuously moving and evolving, far beyond what we can perceive with the naked eye.
The ongoing cosmic vibration of these particles forms all the fields (such as electromagnetic) that maintain the universe—and everything within it—in its structure and order. If you could examine your keyboard up close and personal, it would appear as a chaotic tangle of particles in constant motion.
7. Evolution
Most people attribute one of the most groundbreaking and revolutionary scientific theories to a man named Charles Darwin. However, the concept had been circulating for over 2,000 years before Darwin ever set sail on the HMS Beagle.
The first to propose a theory of evolution was Anaximander of Miletus in the 6th century BC. He believed that animals evolved from marine life. Using fossils and logical deduction, he concluded that humans must have transitioned from the sea to land at some point in the past.
Sadly, the work containing this theory was destroyed, along with 100 other texts, and disappeared into obscurity for a thousand years. We only know of it because an ancient poet recorded it in song, passing it down through generations. Eventually, a 14th-century Italian priest rediscovered it and reintroduced it to the Western world.
6. Survival of the Fittest
In the 5th century BC, a Sicilian philosopher named Empedocles explored the origins of species. His ideas might seem bizarre to modern readers—such as the belief that individual arms, legs, and organs once sprouted from the earth and, through the force of love, combined to form strange hybrids of creatures.
However, along with love, there existed a counterforce known as strife. This opposing force ensured that creatures formed incorrectly could not reproduce and would perish. Only those lucky enough to be formed with the right parts in the correct order would survive and evolve into the animals we recognize today.
This theory is considered the earliest attempt to explain the creation of life without a designer, and it is seen as the precursor to Darwin’s theory of evolution by natural selection: the idea that only the fittest and most capable survive.
5. The Big Bang
Some attribute the idea of the big bang to Stephen Hawking. However, this concept was proposed nearly 3,000 years earlier in ancient India—but not in the manner we might anticipate.
In the Hindu Rig Veda, it is stated that the entire universe exists within a Brahmanda, a cosmic egg. All of space, matter, and creation are contained within this sphere. The universe we perceive expanded from a single point, a Bindu, and will eventually collapse back into that same point.
While it’s difficult to determine if the modern theory of the big bang was influenced by these ancient texts, the central idea of an expanding and contracting universe is remarkably similar.
4. The Divided Self
We often think of ourselves as a unified “self.” Each of us refers to a singular individual, an “I.”
Modern psychology has demonstrated that we are composed of multiple selves simultaneously. Inside our minds, there exists a rational, conscious aspect as well as an emotional, unconscious blend of our physical processes. Both are essential for the human experience.
One ancient philosopher who proposed the idea of a divided self was Plato. He believed that humans were made up of three conflicting elements within their souls—reason, appetite, and spirit. He imagined the soul as a charioteer (reason) struggling to control two horses (appetite and spirit) pulling in opposing directions.
When the three components are in balance, and reason prevails, we feel peace and happiness. However, when our desires and appetites overpower us, we experience internal conflict and distress. This explains why we become angry and stressed when we realize we don’t want another plate of food from the buffet, yet our stomachs lead us there for the fourth time.
3. Indeterminism
Indeterminism is a fundamental concept in quantum mechanics, forming one of the essential pillars of the theory.
It asserts that we can never truly pinpoint a particle’s location until it interacts with something else. Free particles move unpredictably through the universe, interacting in ways that are casual and random.
At the quantum level, certainty is nearly impossible to achieve.
Before quantum theory took over the scientific landscape in the 20th century, it was commonly believed that everything was predetermined. Whether through infallible physical laws or divine intervention, events were thought to unfold in a fixed, predictable manner.
However, the concept of indeterminism has existed for much longer than modern quantum theory.
For example, Aristotle incorporated the concept of chance into his theory of the four causes, a perspective that was quite rare for his time. He argued that certain events in nature are simply accidents.
Among the ancient thinkers, Leucippus, a leading figure in the Atomist school, provided the most accurate description of the quantum world. He believed that atoms moved in “casual and unpredictable ways, quickly and constantly,” which closely aligns with what we understand about atomic behavior today.
2. The Spherical Earth
Thales of Miletus, born in Ionia during the seventh century BC, is regarded as one of the earliest philosophers. He is often seen as the founder of natural philosophy, the discipline that laid the groundwork for modern science as we know it.
Thales sought to uncover the underlying principles of creation, challenged the prevailing Greek myths, and endeavored to understand the origins and causes of the universe.
We owe much of our knowledge of Thales’s ideas to the philosopher Aristotle, who carefully documented and preserved them in his own writings. One significant concept attributed to Thales is the belief in a spherical Earth, as opposed to a flat one.
Thales used his understanding of eclipses to suggest that if the Earth were flat, the Sun would cast an elliptical shadow. He also observed that the stars seemed to shift with the observer’s movement. On a flat Earth, one would expect to see the same stars no matter where they went. Legend has it that Thales was so absorbed in studying the stars that he fell into a well.
It would take more than a thousand years to conclusively prove the Earth’s roundness, as Thales had theorized (and even today, some still question it).
1. Reality Is Perception
In the seventh century BC, a group of early, pre-Socratic philosophers known as the Sophists became the first true relativists. They believed that no absolute truth or objective reality exists. For a Sophist, the way we experience the world—through our senses and minds—is entirely subjective. No two people will ever perceive the world exactly the same way.
Although it may seem odd, considering the shared experiences humans have, our perceptions are actually quite personal. While we may all recognize colors, shapes, smells, and sounds similarly, modern studies have demonstrated that our sensory experiences vary slightly from one another due to the uniqueness of our genetic composition.
Reality is a construct of perception, created through the collaboration of our minds and sensory organs. While there may be an absolute reality out there, we will never truly access it.
