“Anderson and others who want to defend a fundamental truth about marriage—will need to take a similar approach. They need to go much further back in human history—to explore the origins of human monogamy—and draw upon the science behind it to make their case. A tall order? Absolutely. But without it, without a deep understanding of human nature drawn from multiple scientific disciplines, they will never be able to make a truly convincing case that can reach across social and political boundaries.”