Book excerpt: Questions about how we know the world and how it appears according to our knowledge have been of significant interest from ancient times up to the present day. Philosophy and science go hand-in-hand in order to give answers to these fundamental questions. Some aspects of these have been turned into philosophical problems, which provoke a long-lasting and vivid discussion. This book provides answers to such philosophical problems on the basis of a sound and clearly presented argumentation. It will provoke the interest of a broad reading public across the globe, including philosophers, scientists, university students, and inquisitive readers.