BONUS: Mary Kay Built a Business Model with No Ceiling and No Limits. Why?

This is a business episode, not a science one — and it starts with a woman most people only know for a pink Cadillac. Dr. Kylie Burton and Jessica Brickie tell the story of Mary Kay Ash: 25 years in corporate sales, passed over for a promotion in favor of a man she'd personally trained, and once awarded a fisherman's flashlight as a prize for being one of the company's top performers. At 45, newly widowed just a month before launch, and against the advice of her own lawyer and accountant, she...