Even the happiest of people find that on some days they cannot smile. This can come about for many reasons ranging from a sad event to a physical illness. On those days, it is difficult to find one’s smile. Even if we want to look lovingly at the special person in our lives, the corners of our mouth stubbornly retain a frown. Sometimes just a hug can be the ice breaker. But what happens when sadness or even anger linger too long? This is when Robert A. Emmons, Ph.D., a professor of psychology at….