Thales of Miletus was an ancient Greek philosopher who is credited with being the first to propose that all matter is composed of a single substance, which he called the "arche". He believed that this substance was water, and that all other substances were derived from it.

Leucippus was an ancient Greek philosopher who, along with his student Democritus, developed the atomic theory of matter. They believed that all matter is composed of an infinite number of tiny, indivisible particles called atoms, which move around in a void.

Heraclitus was an ancient Greek philosopher who believed that the universe is governed by a single, unchanging principle called the Logos. He argued that everything in the universe is in a state of flux, and that the only constant is change.

Anaxagoras was an ancient Greek philosopher who believed that the universe is composed of an infinite number of seeds, which combine to form different objects. He argued that these seeds are the basic building blocks of all matter, and that they are constantly changing and recombining.

Empedocles was an ancient Greek philosopher who believed that the universe is composed of four elements (earth, air, fire, and water). He argued that these elements are constantly changing and interacting, and that this interaction is responsible for the diversity of the natural world.

Parmenides was an ancient Greek philosopher who argued that the universe is composed of a single, unchanging substance called the One. He believed that the One is perfect, eternal, and immutable, and that it is the source of all being.

Empedocles was an ancient Greek philosopher who believed that the universe is composed of two opposing forces, which he called Love and Strife. He argued that these forces are constantly interacting, and that this interaction is responsible for the diversity of the natural world.

Anaxagoras was an ancient Greek philosopher who believed that the universe is composed of an infinite number of worlds, each of which is governed by its own laws. He argued that these worlds are constantly changing and evolving, and that there is no single, unchanging principle that governs the entire universe.

Leucippus was an ancient Greek philosopher who, along with his student Democritus, developed the atomic theory of matter. They believed that all matter is composed of an infinite number of tiny, indivisible particles called atoms, which move around in a void.

Heraclitus was an ancient Greek philosopher who believed that the universe is governed by a single, unchanging principle called the Logos. He argued that everything in the universe is in a state of flux, and that the only constant is change.

Empedocles was an ancient Greek philosopher who believed that the universe is composed of four elements (earth, air, fire, and water). He argued that these elements are constantly changing and interacting, and that this interaction is responsible for the diversity of the natural world.

Parmenides was an ancient Greek philosopher who argued that the universe is composed of a single, unchanging substance called the One. He believed that the One is perfect, eternal, and immutable, and that it is the source of all being.

Empedocles was an ancient Greek philosopher who believed that the universe is composed of two opposing forces, which he called Love and Strife. He argued that these forces are constantly interacting, and that this interaction is responsible for the diversity of the natural world.

Anaxagoras was an ancient Greek philosopher who believed that the universe is composed of an infinite number of worlds, each of which is governed by its own laws. He argued that these worlds are constantly changing and evolving, and that there is no single, unchanging principle that governs the entire universe.

Leucippus was an ancient Greek philosopher who, along with his student Democritus, developed the atomic theory of matter. They believed that all matter is composed of an infinite number of tiny, indivisible particles called atoms, which move around in a void.