Research has found that we often see sadness as a weakness and that many of us are, in a way, afraid to be sad. But Helen Russell, author of How to Be Sad: Everything I've Learned About Getting Happier by Being Sad, sees value in sadness. Helen has researched sadness from the inside out for her entire life, discovering that the key to happiness is unhappiness. Turns out that when we allow ourselves to experience pain, we learn to truly appreciate and embrace joy.