Introverts, who prefer quieter, lower-stimulation environments, have trouble thriving in today's extrovert-oriented culture, says author Susan Cain. iStockphoto.com hide caption

itoggle caption iStockphoto.com

Moscato was on display at the 2010 international wine and spirits show "Vinitaly" in Italy. Since then, moscato sales have skyrocketed. Luca Bruno/AP hide caption

itoggle caption Luca Bruno/AP