Imagine being onboard a giant space vessel traveling through the galaxy in the distant future. You are part of a multi-generational mission meant to colonize another planetary system. The spacecraft you are on is enormous and can support a city-state of human travelers for thousands of years. Then, one day, a member of the captain’s privy council comes to a startling conclusion: at the current rate of the vessel’s population growth, human requirements will exceed resources in a few hundred years. The captain gathers his trusted advisers in secret to discuss the dilemma. One side is not worried at all....