Sara Blakely’s impossible persistence:At 27 years old, Sara Blakely was selling fax machines and desperate to reinvent her life. So she came up with Spanx — hosiery that eliminates panty lines — and set to work on building her business. In 2012, she was named the youngest self-made female billionaire. In thisHow I Built Thispodcast episode, she breaks down how she did it with no business background, no connections, and no outside funding. “I did not have the most experience in the industry and I did not have the most money. But I cared the most.”