Madison Rifkin invented a bike lock at age 12, patented it at 15, and is now CEO of the company it inspired a decade later. As co-founder of Mount, Madi helps travelers make memories by allowing them to easily rent equipment and gear like kayaks, golf clubs, and scooters. Susan and Madi talk about revenue streams for short-term rental hosts, fundraising, and how to (maybe?) rent a car in Hawaii.