Thales of Miletus is often regarded as the first philosopher in the Western tradition because he was the first to attempt to explain the world using natural causes rather than relying on mythology or religion.

Thales believed that all things in the universe were made of water, and that water was the fundamental substance from which everything else arose.

Anaximenes was a student of Anaximander, and he shared his teacher's interest in explaining the world using natural causes.

Anaximenes believed that all things in the universe were made of air, and that air was the fundamental substance from which everything else arose.

Socrates was a student of Anaxagoras, and he was influenced by his teacher's ideas about the importance of reason and the search for truth.

Anaxagoras believed that all things in the universe were made of tiny particles called seeds, and that these seeds were the fundamental building blocks of reality.

Plato was a student of Pythagoras, and he was influenced by his teacher's ideas about the importance of mathematics and the harmony of the universe.

Pythagoras believed that the universe was governed by mathematical principles, and that these principles could be used to explain the harmony and order of the cosmos.

Heraclitus did not have any known students.

Heraclitus believed that all things in the universe were in a state of constant flux, and that nothing remained the same for long.

Zeno of Elea was a student of Parmenides, and he was influenced by his teacher's ideas about the unity and permanence of being.

Parmenides believed that all things in the universe were one, and that there was no such thing as change or multiplicity.

Empedocles did not have any known students.

Empedocles believed that all things in the universe were made of four elements: earth, air, fire, and water.

Democritus did not have any known students.

Democritus believed that all things in the universe were made of tiny particles called atoms, and that these atoms were the fundamental building blocks of reality.