Why do so many of us feel unloved, even when people love us? This week, I sat down with Sonja Lyubomirsky, a psychology professor who has spent 37 years studying happiness. Sonja talks about how feeling connected and loved is the key to a happier life, the beauty of "radical curiosity," and why being vulnerable makes people like you more, not less. This conversation made me so happy, and I think it's going to make you happy too.