Will Sacks did not plan to go into the menstruation business. When he travelled from Toronto to Reno to attend his first Burning Man festival in August 2009, he only knew that he needed a change. At the age of 29, he was having a personal crisis. “I had forgotten that I wanted to be an entrepreneur,” he told me earlier this year. “I had forgotten that I wanted to create a company that could put a dent in the universe.” He quit his job as an energy efficiency consultant, shut down the small online business he had been running on the side, and booked a plane ticket to the desert.