One of my favorite kinds of news stories is the report of a new scientific study that verifies the obvious. You've seen them. New research finds that heterosexual men are attracted to very attractive women. Evidence collected by wildlife researchers has confirmed that bears really do use the woods as toilets. But some research that corroborates the obvious is exciting because some people refuse to accept the obvious. Which brings me to the work of Dr. Gregory Berns, a neuroscientist at Emory University and the author of "What It's Like to Be a Dog." Berns has, from what I can...