Project H started the Hippo Roller project in 2008, to make it easier to collect and distribute water. Instead of carrying 90 litres of water on their head, as they had been doing for hundreds of years, the Hippo Roller was designed to make life easier. Traditionally, women and children are responsible for collecting the water, so this simple invention has freed up their lives for education and other nice things.
1 in 6 people don't have access to running water, and for only $100 each, the Hippo Roller has transformed people's lives. All the kids at my daughter's kindergarten chipped in to buy one, which was nice.
Here's a great interview with Emily Pilloton, the inspiring founder of Project H. You can download it to listen to.