Thales: Did you mean...?

Archelaus of Athens (l. c. 5th century BCE) was a Pre-Socratic philosopher in ancient Greece who claimed the first cause of existence was the opposition of cold and heat which caused the separation of the universal essence...

Xenophanes of Colophon (l.c. 570-c.478 BCE) is known as one of the Pre-Socratic philosophers of ancient Greece, so-called because they pre-date Socrates (l. c. 470/469-399 BCE), recognized as the Father of...

Greece is a country in southeastern Europe, known in Greek as Hellas or Ellada, and consisting of a mainland and an archipelago of islands. Ancient Greece is the birthplace of Western philosophy (Socrates, Plato, and Aristotle...

In this collection of 20 biographies of ancient Greek philosophers, we examine the thoughts and lives of some of the most important thinkers in history. We look at the pre-Socratic philosophers and the titan trio of Socrates...

Heraclitus of Ephesus (l. c. 500 BCE) famously claimed that “life is flux” and, although he seems to have thought this observation would be clear to all, people have continued to resist change from his time to the present...

The Seven Sages of ancient Greece (hoi hepta sophoi, "the Seven Wise Men") were a celebrated group of Archaic Greek thinkers, lawmakers, rulers, and statesmen remembered...

Mesopotamia (from the Greek, meaning "between two rivers") was an ancient region located in the Near East (Middle East) bounded in the northeast by the Zagros Mountains and in the southeast by the Arabian Plateau...

Euclid of Alexandria (lived c. 300 BCE) systematized ancient Greek and Near Eastern mathematics and geometry. He wrote The Elements, the most widely used mathematics and geometry textbook in history. Older books sometimes confuse him...

The term science comes from the Latin word scientia, meaning "knowledge". It can be defined as a systematic attempt to discover, by means of observation and reasoning, particular facts about the world, and to establish laws connecting...

Aristarchus of Samos (l. c. 310 - c. 230 BCE) was a Greek astronomer who first proposed a heliocentric model of the universe in which the sun, not the earth, was at the center. Although his theory was noted by other thinkers...