Aristarchus of Samos (310 BCE - 230 BCE) found a book consisting of some hypotheses in which the premises lead to the conclusion that the universe is many times larger than currently recognized. His hypotheses are that the fixed stars and the Sun do not move, that the Earth revolves around the Sun in the circumference of a circle, with the Sun resting in the middle of the orbit.
— Archimedes, The Sand Reckoner.
For thousands of years, humanity was obscured by simple answers to complex questions. Why didn’t it rain this harvest? Why did the river dry up? Why does the soil no longer bear fruit? Why do we fall ill? The simple answer: the universe is a puppet whose strings are moved by gods or goddesses, invisible and impossible to fully comprehend in their magnitude.
However, 2,500 years ago, there was a glorious awakening in Ionia: in Samos and other nearby Greek colonies that flourished among islands and inlets in the bustling eastern Aegean Sea. Suddenly there were people who believed that everything was made of atoms; that humans and other animals had arisen from simpler forms; that diseases were not caused by demons or gods; that the Earth was merely a planet orbiting the Sun; and that the stars were very, very far away.
This revolution gave birth to science from the incomprehensible. The universe is understandable, argued the ancient Ionians, because it presents an internal order: there are regularities in nature that allow its secrets to be uncovered.
The first Ionian scientist was Thales of Miletus, who proved geometric theorems, demonstrating them without the arduous analysis later given by Euclid three centuries later — for example, the proposition that the base angles of an isosceles triangle are equal. There is a clear continuity of intellectual effort from Thales and Euclid to Isaac Newton, 2,000 years later, an event that accelerated modern science and technology.
Anaximander of Miletus, a friend and colleague of Thales, was the first person in Greece to make a sundial. He argued that we are so helpless at birth that if the first human infants had been placed into the world and left alone, they might have died immediately. From this, Anaximander concluded that humans must have originated from other animals with more capable newborns. More than 2,000 years before Darwin and Wallace’s theory of evolution, he proposed the spontaneous generation of life in mud, with the first animals being fish covered in spines. Some descendants of these fish eventually abandoned the water and moved to dry land, evolving into other animals through the transmutation of one form into another.
Empedocles, who flourished around 450 BCE, proposed that light traveled at a finite speed rather than instantaneously—an idea far ahead of his time. It was not until the 17th century that Ole Rømer provided the first quantitative measurement of the speed of light by observing the moons of Jupiter, laying the groundwork for later breakthroughs in physics, including Einstein's theory of general relativity. Empedocles also taught that there had been a great variety of beings on Earth, but that many races of creatures "were unable to reproduce and continue their species." Knowledge that was obscured for hundreds of years until Cuvier (1798 CE) establish extinction as a fact that any future scientific theory of life would have to explain.
At a time when no one had heard of impact craters, Democritus (460 BCE) thought that worlds occasionally collided; he believed that some worlds wandered alone in the darkness of space, while others were accompanied by multiple suns and moons; that some worlds were inhabited, while others had no plants, animals, or even water; and that the simplest forms of life emerged from a kind of primordial mud. More than 2,000 years before John Dalton, Democritus coined the word atom, the Greek equivalent of "indivisible." Atoms, he said, were the ultimate particles, forever frustrating any attempts to break them into smaller pieces. Everything, he argued, is a collection of atoms, intricately arranged—even us. "Nothing exists except atoms and the void."
In an intellectual exercise, Democritus imagined calculating the volume of a cone or a pyramid using an immense number of extremely small plates, diminishing in size from base to apex. He posed a problem that, in mathematics, is called the theory of limits. He was on the verge of discovering differential and integral calculus, the fundamental tool for understanding the world, which, as far as we know from surviving records, was not fully developed until Isaac Newton. Perhaps if Democritus' work had not been entirely lost, calculus might have been discovered in the time of Christ.
The Ionian influence and the experimental method spread throughout Greece, Italy, and Sicily. However, in their time, the brief tradition of tolerance for unconventional views began to erode and then collapse. People started being punished for expressing different ideas. Their knowledge was suppressed, and their influence on history diminished.
The mystics were beginning to win.
The great scientists, from Thales to Democritus and Anaxagoras, are often described in philosophy or history books as pre-Socratic, as if their primary function had been to sustain philosophical essence until Socrates, Plato, and Aristotle, and perhaps influence them a little. Instead, the ancient Ionians represent a different and quite contradictory tradition, one that aligns more closely with modern science. Because their influence remained powerful for only two or three centuries, there was an irreparable loss for all human beings who lived between the Ionian Awakening and the Italian Renaissance.
After the Ionian period, philosophers like Plato and Aristotle gained great prominence. Plato, in particular, emphasized the world of ideas, while Aristotle developed a highly comprehensive philosophical system that ended up dominating Western thought for centuries. The more speculative approach of the Ionian philosophers, focused on natural causes, was ultimately overshadowed by these currents of thought.
With the decline of Greece, the rise of the Roman Empire, and later the expansion of Christianity within the Roman Empire, there was a tendency to reject pagan thought, especially ideas that contradicted the Christian worldview. Since the Ionians presented natural explanations for the cosmos, without resorting to gods or supernatural forces, their ideas were seen as incompatible with Christian theology.
In recognizing, as Pythagoras and Plato did, that the Cosmos is comprehensible and that there is a mathematical framework underlying Nature, there was a great advancement in science. However, in the suppression of facts, information, events, or truths that caused discomfort; in the idea that science should be reserved for an elite few; in the aversion to experimentation; in the acceptance of mysticism; and in the passive acceptance of slave societies, they delayed the human scientific enterprise. This suppression led to a long hibernation of scientific thought. Eventually, however, the Western world awakened. Experimentation and free inquiry once again became respected.
It is said that of the seventy-three books written by Democritus, none have survived. All that we know of him comes from fragments, mainly concerning ethics and unoriginal justifications. The same applies to nearly all other ancient Ionian scientists.
More than 2,000 years later, forgotten books and fragments were rediscovered. Da Vinci, Columbus, and Copernicus rekindled the scientific flame that had been extinguished for centuries. This period enabled advancements in various fields of knowledge, once again placing humanity in a context of social and technological development.
History shows us that just as science was rediscovered after thousands of years of obscurity, it can also be forgotten or suppressed again if not properly safeguarded. Ignorance of scientific truths leads to regression, misinformation, and the rise of misconceptions that can dominate public opinion. Only by holding science as a guiding light in the darkness can we prevent another "blackout of reason" and ensure that the scientific achievements that so greatly benefit humanity continue to be disseminated and recognized, thus guaranteeing continuous improvements in the quality of life for society as a whole.
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