Got some bicycles rusting in your basement? It could could have a second life as a water pump, grinder, or nut sheller. In fact, it could help these folks grind 3,000 pounds of corn a day in rural Guatemala. Using cast-off bikes from the United States and Canada, Maya Pedal fashions a range of bicimaquinas (pedal powered machines) that are helping pull Guatemalan subsistence farmers out of poverty. Source for how you can help.