“The avoidance or postponement of answering such deep and basic questions was traditionally the province of religion, which excelled at it. Every thinking person always knew that an insuperable mystery lay at the final square of the game board, and that there was no possible way of avoiding it. So, when we ran out of explanations and processes and causes that preceded the previous cause, we said, “God did it.” Now, this book is not going to discuss spiritual beliefs nor take sides on whether this line of thinking is wrong or right. It will only observe that invoking a deity provided something that was crucially required: it permitted the inquiry to reach some sort of agreed-upon endpoint. As recently as a century ago, science texts routinely cited God and “God’s glory” whenever they reached the truly deep and unanswerable portions of the issue at hand.”