Did you know that the famous Greek philosopher Socrates never actually wrote any of his teachings down? Instead, his ideas were passed down through the works of his student Plato. Another well-known philosopher, Aristotle, was a student of Plato and went on to become the teacher of Alexander the Great. One of the most influential modern philosophers is Friedrich Nietzsche, known for his ideas on the will to power and the concept of the Ubermensch (overman). Jean-Paul Sartre, a key figure in existentialism, famously stated that existence precedes essence, emphasizing personal responsibility and the freedom to choose one's own path in life. Immanuel Kant, a leading figure in the 18th-century Enlightenment, developed the concept of the categorical imperative, which argues for acting according to principles that can be universalized. These are just a few examples of the diverse range of thinkers who have made significant contributions to the field of philosophy throughout history.