I just purchased The Expanding Circle: Ethics, Evolution, and Moral Progress. I had intended to buy The Expanding Circle: Ethics and Sociobiology, but a perusal of Amazon.com revealed the existence of this 2011 revised/updated version of Peter Singer's classic ethics tome. I shall read the book and comment for the LIBERTARIAN BIOETHICS BLOG at a future date.
LIBERTARIAN BIOETHICS BLOG
Don Stacy is a 47 yo libertarian writer and physician. His articles have been published by multiple libertarian-themed websites. He practices medicine as a radiation oncologist in Hazard, KY.