This book summarizes the author's personal philosophy and conception of reality based on the latest scientific evidence. It explains the strengths and the weaknesses of the religious and scientific worldviews and comes up with an alternative view based on Naturalism. For Naturalists the world is a unitary, causally interconnected system without supernatural entities or systemic purpose. Knowledge about the world comes from the study of Natural Sciences, especially physics and molecular biology. Evolutionary Psychology is used to explain human behavior, including our irrationality and tendency for self-destruction, which are the causes of the current world crises. Solving the problems of inequality, violence and environmental destruction may permit us to survive the 21st century and enjoy a bright future. This worldview can be a source of meaning and spirituality similar to that of liberal religion.