Socrates is widely regarded as the father of Western philosophy due to his profound influence on subsequent philosophers and his emphasis on critical thinking and ethical inquiry.

René Descartes, a French philosopher, is credited with the famous quote "Cogito, ergo sum" (I think, therefore I am), which emphasizes the fundamental certainty of one's own existence.

Plato's Allegory of the Cave is a thought experiment that explores the nature of reality and knowledge, using the metaphor of prisoners chained in a cave, only able to see shadows of objects projected onto a wall.

Plato founded the Academy in Athens, which became a prominent center for philosophical discussion and learning in ancient Greece.

Aristotle's Nicomachean Ethics is a seminal work in moral philosophy, exploring the nature of virtue, happiness, and the good life.

Democritus is credited with developing the atomic theory, proposing that all matter is composed of indivisible particles called atoms.

The Pythagorean Theorem states that in a right triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides.

Anaximander was the first Greek philosopher to propose that the Earth is round, a revolutionary idea at the time.

Heraclitus is known for his philosophy of flux and change, arguing that everything is in a state of constant transformation and that opposites are necessary for each other's existence.

Hippocrates is widely regarded as the father of modern medicine due to his emphasis on clinical observation, ethical principles, and the importance of a holistic approach to patient care.

Claudius Ptolemy developed a geocentric model of the universe, which placed the Earth at the center and the Sun, Moon, and other planets orbiting around it.

Archimedes developed the method of exhaustion, a precursor to modern calculus, to calculate the area of a circle and other geometric figures.

Euclid's Elements is a foundational work in geometry, presenting a set of axioms and theorems that form the basis for much of modern geometry.

Empedocles proposed that all matter is composed of four elements: earth, air, fire, and water, and that these elements interact to create the diversity of the natural world.

Pythagoras is credited with discovering the Golden Ratio, a special proportion found in nature and art, often represented by the Greek letter phi (φ).