The California Supreme Court's decision to allow same-sex marriage was greeted with both joy, and indifference. Joy from the gay community, where some couples had waited over quarter of a century to officially affirm their bonds. And indifference from much of the rest of California, including the anti-gay-marriage lobby.

But, is there any science that can help shed light on gay marriage? We are wary that past scientific 'contributions' have added at least as much heat as light...