One of the world's best experts on the history of science, George Sarton, captivatingly and vividly paints a picture of the development of mathematics, astronomy, physics, biology, and medicine as they arose in prehistory and flourished in ancient Greek society. The first part of the book is devoted to the early evidence of mathematics, astronomy and other sciences, then to the achievements of Egypt, Mesopotamia, the beginning of Greek civilization and the flowering of Ionian science in the 6th BC. e. This era belongs to Thales of Miletus, Anaximander, Anaximenes and Xenophanes, Pythagoras, whose teachings are given special attention. The second part opens with the rise of Athens in the 5th century. BC e. These are masterpieces of poetry, fine art, philosophy and science. Heraclitus, Anaxagoras, Parmenides, Democritus, Hippocrates, Herodotus and many others are represented here. Part three is about outstanding Greek thinkers of the 4th century. BC e.: Plato and his Academy, Aristotle, Xenophon, the school of Cynics, Stoics, Skeptics, Epicureans. Illustrations explain and decorate the narrative. The publishing layout of the book is saved in PDF A4 format.