In this book Agustin Galan explores the philosophy of elementary particles (the ultimate reality) through works of popular science published in recent years. Designed to help readers understand the latest discoveries and theories of modern astrophysics, the book achieves this goal by showing their phylosophycal consecuences. This is one of the most interesting ways to paint a complete picture of our modern world while exploring the concepts used by scientists. Written by a journalist with a deep interest in philosopy, Agustin Galan has produced a crystal clear synthesis of sophisticated theories, accesible to most readers. The Ultimate Piece of the Universe tells the story of the underlying metaphysics of modern physics combining literary and scientific discourse, mixing Borges with Einstein or Walt Whitman with Dawkins. This endless persuit for the ultimate missing piece of the puzzle of the Universe takes us down a road where Stephen Hawking and his colleague's explore highly conceptual physics; where a philosophical essay or quantum theology (in the spirit of Borges) suggest that nobody may know if the words 'Universe' and 'God' differ. Through this book the author has achieved an informative and thought provoking text on physics and metaphysics.