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Democritus ([Δημόκριτος, Dēmokritos] Error: {{Lang-xx}}: text has italic markup (help), "chosen of the people") (ca. 460 BC - ca 370 BC) was born in Abdera in the north of Greece.^[1] He was the most prolific, and ultimately the most influential, of the Presocratic philosophers: his atomic theory may be regarded as the culmination of early Greek thought.^[2]

Democritus' exact contributions are difficult to disentangle from his mentor Leucippus, as they are often mentioned together in texts. Their hypothesis on atoms is remarkably similar to modern science, and avoided many of the errors found in their contemporaries. Largely ignored in Athens, Democritus was nevertheless well-known to his fellow northern-born philosopher Aristotle. Plato is said to have disliked him so much that he wished all his books burnt.^[3] Many consider Democritus to be the "father of modern science".^[4]

Democritus was born in the city of Abdera in Thrace, an Ionian colony of Teos,^[5] although some called him a Milesian.^[6] His year of birth was 460 BCE according to Apollodorus, who is probably more reliable than Thrasyllus who placed it ten years earlier.^[7] John Burnet has argued that the date of 460 is "too early", since according to Diogenes Laertius 9.41 Democritus said that he was a "young man (neos)" during Anaxagoras' old age (circa 440-428).^[8] It was said that Democritus' father was so wealthy that he received Xerxes on his march through Abdera. Democritus spent the inheritance which his father left him on travels into distant countries, to satisfy his thirst for knowledge. He travelled to Asia, and was even said to have reached India and Ethiopia.^[9] We know that he wrote on Babylon and Meroe; he must also have visited Egypt, and Diodorus Siculus states that he lived there for five years.^[10] He himself declared,^[11] that among his contemporaries none had made greater journeys, seen more countries, and met more scholars than himself. He particularly mentions the Egyptian mathematicians, whose knowledge he praises. Theophrastus, too, spoke of him as a man who had seen many countries.^[12] During his travels, according to Diogenes Laërtius, he became acquainted with the Chaldean magi. A certain "Ostanes", one of the magi accompanying Xerxes was also said to have taught him.^[13]

After returning to his native land he occupied himself with natural philosophy. He travelled throughout Greece to acquire a knowledge of its culture. He mentions many Greek philosophers in his writings, and his wealth enabled him to purchase their writings. Leucippus, the founder of the atomism, was the greatest influence upon him. He also praises Anaxagoras.^[14] The tradition that he was friends with Hippocrates seems to have been based on spurious letters.^[15] He may have been acquainted with Socrates, but Plato does not mention him and Democritus himself is quoted as saying, "I came to Athens and no one knew me."^[16]. Though Aristotle viewed him as a pre-Socratic.^[17], it should be noticed that since Socrates was born in ca. 469 BC (about 9 years before Democritus), it is very possible that Aristotle's remark was not meant to be a chronological one, but directed towards his philosophical similarity with other pre-Socratic thinkers.

The many anecdotes about Democritus, especially in Diogenes Laërtius, attest to his disinterestedness, modesty, and simplicity, and show that he lived exclusively for his studies. One story has him deliberately blinding himself in order to be less disturbed in his pursuits;^[18] it may well be true that he lost his sight in old age. He was cheerful, and was always ready to see the comical side of life, which later writers took to mean that he always laughed at the foolishness of people.^[19]

He was highly esteemed by his fellow-citizens, "because," as Diogenes Laërtius says, "he had foretold them some things which events proved to be true," which may refer to his knowledge of natural phenomena. According to Diodorus Siculus,^[20] Democritus died at the age of 90, which would put his death around 370 BC, but other writers have him living to 104,^[21] or even 109.^[22]

Popularly known as the Laughing Philosopher, the terms Abderitan laughter, which means scoffing, incessant laughter, and Abderite, which means a scoffer, are derived from Democritus.^[23]

Democritus followed in the tradition of Leucippus, who seems to have come from Miletus, and he carried on the scientific rationalist philosophy associated with that city. They were both strict determinists and thorough materialists who believed everything to be the result of natural laws. They both deny that anything can happen by chance. Unlike Aristotle, Plato, and Socrates, the atomists attempted to explain the world without the notion of purpose, prime mover, or final cause. For the atomists, questions should be answered with a mechanistic explanation ("What earlier circumstances caused this event"), while their opponents searched for teleological explanations ("What purpose did this event serve?"). The history of modern science has shown that mechanistic questions lead to scientific knowledge, while the teleological question does not. The atomists looked for mechanistic questions, and gave mechanistic answers. Their successors until the Renaissance became occupied with the teleological question, leading science up a blind alley. ^[24]

The hypothesis of Leucippus and Democritus held everything to be composed of atoms, which are physically, but not geometrically, indivisible; that between atoms lies empty space; that atoms are indestructible; have always been, and always will be, in motion; that there are an infinite number of atoms, and kinds of atoms, which differ in shape, size, and temperature. Of the weight of atoms, Democritus said "The more any indivisible exceeds, the heavier it is." But their exact position on weight of atoms is disputed.^[25]

Aristotle criticized the atomists for not providing an account for how the original motion of the atoms could have begun, but in this they have been vindicated as more scientific than their critics. Even if a prime mover or creator is supposed, that force remains unaccounted for. The theory of the atomists is, in fact, more nearly that of modern science than any other theory of antiquity. However, their theories were not wholly empirical, and their belief was devoid of any solid foundation. The atomists can be viewed as having hit on a hypothesis for which, two thousand years later, some evidence happened to be found.^[26]

The void hypothesis was a response to the paradoxes of Parmenides and Zeno, the founders of metaphysical logic, who put forth difficult to answer arguments in favor of the idea that there can be no movement. They held that any movement would require a void — which is nothing — but nothing cannot exist. The Parmenidean position was "You say there is a void; therefore the void is not nothing; therefore there is not the void." The position of Parmenides appeared validated by the observation that where there seems to be nothing there is air, and indeed even where there is not matter there is something, for instance light waves. The atomists agreed that motion required a void, but simply ignored the argument of Parmenides on the grounds that motion was an observable fact. Therefore, they asserted, there must be a void. On this point Aristotle was in agreement, and it survived in a refined version as Newton's theory of absolute space, which met the logical requirements of attributing reality to not-being. Einstein and quantum theory provided the final definitive answer to Parmenides and Zeno — with the insight that space is a system of relations — and Newton's refinement is now considered superfluous.^[27]

The ethics and politics of Democritus come to us mostly in the form of maxims. He says that "Equality is everywhere noble," but he is not insightful enough to include women or slaves in this sentiment. Poverty in a democracy is better than prosperity under tyrants, for the same reason one is to prefer liberty over slavery. Those in power should "take it upon themselves to lend to the poor and to aid them and to favor them, then is there pity and no isolation but companionship and mutual defense and concord among the citizens and other good things too many to catalogue." Money when used with sense leads to generosity and charity, while money used in folly leads to a common expense for the whole society— excessive hoarding of money for ones children is avarice. While making money is not useless, he says, doing so as a result of wrong-doing is the "worst of all things." He is on the whole ambivalent towards wealth, and values it much less than self-sufficiency. He disliked violence but was not a pacifist: he urged cities to be prepared for war, and condoned the right of a society to execute a criminal so long as laws had not been explicitly drawn forbidding such action.^[28][29]

Goodness, he believed, came more from practice and discipline than from innate human nature. He believed that one should distance oneself from the wicked, stating that such association increases ones disposition to vice. Anger, while difficult to control, must be mastered in order for one to be rational. Those who take pleasure from the disasters of their neighbors fail to understand that their fortunes are tied to the society in which they live, and they rob themselves of any joy of their own. He advocated a life of contentment with as little grief as possible, which he said could not be achieved through either idleness or preoccupation with worldly pleasures. Contentment would be gained, he said, through moderation and a measured life; to be content one must set their judgment on the possible and be satisfied with what one has, giving little thought to envy or admiration. Democritus approved of extravagance on occasion, as he held that feasts and celebrations were necessary for joy and relaxation. He considers education to be the noblest of pursuits, more important than wealth, but cautioned that learning without sense leads to error.^[30][31]

He was also a pioneer of mathematics and geometry in particular. We only know this through citations of his works (titled On Numbers, On Geometrics, On Tangencies, On Mapping, and On Irrationals) in other writings, since most of Democritus' body of work did not survive the Middle Ages. Democritus was among the first to observe that a cone or pyramid has one-third the volume of a cylinder or prism respectively with the same base and height. Also, a cone divided in a plane parallel to its base produces two surfaces. He pointed out that if the two surfaces commensurate with each other, then the shape of the body would appear to be a cylinder, as it is composed of equal rather than unequal circles. However, if the surfaces do not commensurate, then the side of a cone is not smooth but jagged like a series of steps.^[32]

He also wrote a treatise on irrational numbers, but little is known as to its contents.^[33]

His work on nature is known through citations of his books on the subjects, On the Nature of Man, On Flesh (two books), On Mind, On the Senses, On Flavors, On Colors, Causes concerned with Seeds and Plants and Fruits, and Causes concerned with Animals (three books).^[34] He spent much of his life experimenting with and examining plants and minerals, and wrote at length on many scientific topics. He believed that flavors were due to the shape of the atoms composing the taste; sharp if angular, crinkled, small, and fine; sweet if round and not too small, sour if large, many angled, and with as little roundness as possible; and so on.^[35] Democritus thought that the first men lived an anarchic and animal sort of life, going out to forage individually and living off the most palatable herbs and the fruit which grew wild on the trees. They were driven together into societies out of fear of wild animals, he said. He believed that these early men had no language, but that they gradually began to articulate their expressions, and that they established symbols among themselves for every sort of object, thus making the interpretation in each instance intelligible to each other. He says that the earliest men lived laboriously, having none of the utilities of life, such as clothes, houses, fire, domestication, or farming. Democritus presents the early period of mankind as one of learning by trial and error, and says that each step slowly lead to more discoveries: they took refuge in the caves in winter, stored fruits that could be preserved, and through reason and keenness of mind came to build upon each new idea.^[36][37]

Democritus held that the earth was round, and stated that originally the universe was comprised of nothing but tiny atoms, churning in chaos, until they collided together to form larger units, including the earth and everything on it.^[38]

• Atom
• John Dalton

• Bailey C. (1928) The Greek Atomists and Epicurus. Oxford
• Bakalis Nikolaos (2005) Handbook of Greek Philosophy: From Thales to the Stoics Analysis and Fragments, Trafford Publishing, ISBN 1-4120-4843-5
• Barnes J. (1982) The Presocratic Philosophers, Routledge Revised Edition
• Burnet J. (2003) Early Greek Philosophy, Kessinger Publishing
• Guthrie W. K. (1979) A History of Greek Philosophy – The Presocratic tradition from Parmenides to Democritus, Cambridge University Press.
• Kirk G. S., Raven J. E. and Schofield M. (1983) The Presocratic Philosophers, Cambridge University Press, Second edition.
• Melchert, Norman (2002). The Great Conversation: A Historical Introduction to Philosophy. McGraw Hill. ISBN 0-19-517510-7.
• Ancilla To The Pre-Socratic Philosophers, translated by Kathleen Freeman.
• Pyle, C. M. (1997). 'Democritus and Heracleitus: An Excursus on the Cover of this Book,' Milan and Lombardy in the Renaissance. Essays in Cultural History. Rome, La Fenice. (Istituto di Filologia Moderna, Università di Parma: Testi e Studi, Nuova Serie: Studi 1.) (Fortuna of the Laughing and Weeping Philosophers topos)
• Petronius. Satyricon. Trans. William Arrowsmith. New York: A Meridian Book, 1987.

• O'Connor, John J.; Robertson, Edmund F., "Democritus", MacTutor History of Mathematics Archive, University of St Andrews
• Democritus in The Internet Encyclopedia of Philosophy
• Democritus and Leucippus
• Democritus in Stanford Encyclopedia of Philosophy
• Democritus on Greek 100 Drachma banknote.

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