About 2000 years ago, there were two famous philosophers in ancient Greece, Socrates (469- 399 BC) and Plato (427- 347 BC). Plato is a student of Socrates. Later, Plato learned something and decided to recruit students like Socrates as teachers to impart knowledge and ideas to the world. In 399 BC, Socrates was tried and sentenced to death. Plato was completely disappointed with the existing regime, so he began to travel around Italy, Sicily, Egypt, Cyrene and other places for knowledge. At the age of forty (about 387 BC), he returned to Athens after a trip and established his own school Academie in the holy city of Akkademi, a northwest suburb of Athens. Academie became one of the earliest well-organized institutions of higher learning in western civilization, hence its name as the later academic institution, and it was also the predecessor of the developed universities in the Middle Ages. Akademi is located in a land that used to be the residence of the legendary Greek hero Akademi Deimos, so it was named after it, and later it was called the Greek Academy. Students come from many city-states in Athens and Greece. In the college, Plato not only taught philosophy, but also taught mathematics, astronomy, physics, psychology, music theory and so on. Teaching by Socrates' question-and-answer method, having a cordial conversation with students and imparting knowledge in answers. Plato taught and wrote books in college for 40 years until his death.