By Jaswanth Madhavan, ONE policy team  We know how important toilets are in the fight against water contamination and diarrheal disease. But because of infrastructure and cost, conventional toilets don’t always work in developing countries – and as a result, 35% of the world’s population to lack access to basic, working toilets. Fortunately, there are a few cost-effective, eco-friendly, sustainable toilet solutions out there that work for all kinds of environments. It’s creative thinking like this that can help increase the number of people who have...