Around the world, more than three-quarters of a billion people have no clean water source near their homes. And 1. 7 billion don't have access to a toilet. This crisis affects a third of the people on the planet. It keeps kids out of school and women out of work. It traps people in extreme poverty. It spreads disease. It's also solvable. That conviction is what brought together movie actor Matt Damon and water expert and engineer Gary White. They spent years getting the answer wrong, then halfway right, then almost right. Over time, they and their organization, Water. org, have found an approach that works. Working with partners across East Africa, Latin America, South Asia, and Southeast Asia, they've helped over 40 million people access water and/or sanitation. Gary and Matt take us along on the journey-telling stories as they uncover insights, try out new ideas, and travel between the communities they serve and the halls of power where decisions get made.