Philosophy has a reputation for being obscure, highfaluting, and not terribly practical or useful. However, if one is not easily dismayed by these misconceptions then it's possible to learn a lot about the world and our conceptions of it from studying some of the most interesting philosophical questions. This well designed and well-written short introduction aims to present some of the most thought-provoking ideas from the rich history of philosophy. Whether you have never read any philosophical work or are a seasoned armchair philosopher, you will find many interesting pieces of information within the covers of this book. It provides a brief reference for 50 philosophical concepts or idea. These are explained in short 300 word sections, with an accompanying illustrations and several even shorter references. The topics covered include: Frege's puzzle, Hume's problem of induction, the brain in a vat, Pascal's wager, Plato's cave, and many more. The explanations are very lucid and intuitive, and they only require some good old common sense for the full understanding. The illustrations are done in a mock fifties style and they convey a slight panache for self-irony. The book is printed on a high-quality glossy paper and can almost function as a coffee table book. It makes a nice little reference or can be used as a thoughtful gift.