We've always suspected that a good ear scratch is a two-way street. Now a team of scientists has put a little data behind the hunch. What the researchers did Psychologists at the University of Innsbruck in Austria invited 64 dog owners to their lab, each with their own dog (every pup was at least 2 years old and comfortable in a new room). The owners then sat through two rounds of deliberately stressful tasks: a rapid-fire trivia quiz with only seconds per answer, and mental