Waterloo student-founded company Safi ?" from the Swahili word for "pure" or "safe" ?" is a startup with an ambitious mission. They want to empower East African farmers to pasteurize milk cheaply and easily, with the ultimate goal of ending milk-transmitted disease. Today, Safi's founders are working with governments, presenting at international conferences and preparing for a 300-unit test rollout in Rwanda. Two years ago, however, Safi was just an idea. When the COVID-19 pandemic hit, Miraal Kabir, Daria Margarit and Martin Turuta ?" all classmates from the Math-Business dual degree program and good friends ?" felt helpless. Then, in early 2021, they saw an advertisement for Challenge4ClimateAction, a contest encouraging young entrepreneurs to address a climate change-related problem affecting the Global South. They decided to assemble a team and enter, though they weren't sure yet which problem to address.