I tried Denmark's No. 1 secret to happiness for a year. It truly changed my life—and even made me more confident

For over four years, I've been a professor at Emory University's Goizueta Business School. Before that, I worked in the corporate world at organizations like Coca-Cola and IBM. Recently, for work, I went to Denmark, one of the world's happiest countries, to teach a course called "Happiness…