A very brief introduction to the ideas of famous philosophers (Socrates, Plato, Augustine, Descartes, Kant, Sartre and many others) to the so-called “non-specialists” by Erich Kästner. The book is suitable for high school students, as well as for people who’d like to start reading Hegel but are still afraid. What’s written here is not philosophy, but a concise touch on the history of philosophy.