He built a seven-note harmonic musical scale.

He believed that both the universe and man are constructed on the same harmonic proportions.

He fought bravely for Athens in the Peloponnesian War and in one of the battles saved the life of one of his friends.

He was sentenced to death as a heretic.

Wrote about the ideal state that should be governed only by wise people.

His works survived only in the writing of his students.

He first mentioned Atlantis in one of his dialogues.

He discussed problems with his advanced students while working in the garden. Because he walked about while teaching his school was called Peripatetic (which means "to walk about") school.

His philosophy also influenced the civilization of all of eastern Asia.

He tutored young Macedonian prince, future conqueror of the world - Alexander the Great. After Alexander became king, at 20, he gave his teacher a large sum of money to set up a school in Athens.

Explained his ideas in the form of dialogues.

He emphasized the importance of having high moral principles as the basis of wisdom.