To treat some human beings as less worthy of concern and respect than others is to lose sight of their humanity.  But what does this moral blindness amount to?  What are we missing when we fail to appreciate the value of humanity?  Oxford University Press has recently published a collection of essays addressing  these, and related, questions.  Co-edited by Sarah Buss and Nandi Theunissen (Pittsburgh), Rethinking the Value of Humanity contains an introduction by Sarah and an essay by Peter Railton.