'7 Genius Hacks Saving Lives in the World's Poorest Places' - including 'A Better Way to Collect Water' - TakePart.com article

"Enter the Hippo Water Roller (http://www.hipporoller.org), a durable contraption designed by South Africans that cuts down on the time and effort necessary to transport water by allowing it to be rolled rather than carried. Hippo Water Rollers typically last five to seven years, and executive director Grant Gibbs estimates that more than 300,000 people have transported around 1.85 billion gallons of water with the device over the past two decades, spanning a distance of 311 million miles. The cost is $125 to users, $167 to donors."