 And I'm Guy Raz. Today, Maureen Kelly, founder of the cosmetics company Tarte, joins me on a How I Built This advice line to answer questions from two early-stage entrepreneurs about how to market their products and learn from their mistakes. Embrace failure as a lesson. Understand that it's not the opposite of success. It's part of success. It's an hour of economics and innovation on How I Built This. And planning money from NPR.