In a series of 50 accessible essays, Ben Dupre introduces and explains the philosophical questions around knowledge, consciousness, identity, ethics and justice that have engaged the minds of thinkers from the Ancient Greeks to the present day. From Plato's cave to virtue ethics, theories of punishment to animal rights, 50 Philosophy Ideas You Really Need to Know is a complete introduction to the most important philosophical concepts in history. All you need to know about the central ideas of philosophy.