In this episode of "How I Built This Lab," Guy Raz hosts Marcia Kilgore, a serial entrepreneur and founder of Beauty Pie, to answer business questions from listeners. The episode features three entrepreneurs seeking advice on various challenges: scaling an ice cream business, overcoming the fear of failure in a skincare line, and optimizing sales channels for custom bike bags. Marcia Kilgore provides practical and actionable advice, drawing from her extensive experience in building successful brands, emphasizing the importance of market research, branding, customer engagement, and iterating based on feedback.