While visiting the 2005 World Exposition in Japan, Javier Fernandez-Han and his family came across a mock refugee camp staged by Doctors Without Borders. "I didn't know people lived in those situations, without drinkable water, food and shelter," he says. "I realized I wanted to focus on systems for sustainable living." In 2009, at the age of 15, he began to integrate existing and modified devices such as a water pump and a flush latrine into an all-in-one system for refugee camps and small villages in the developing world. Among other functions, his invention treats sewage, turns harmful gases including methane into fuel for algae, and produces oxygen and algae biomass that can feed livestock. Later that year, he won the Ashoka Lemelson Excellence Award for the device. Soon he began to wonder: If he created this system by himself, what could a whole team of inventors do? He founded two groups, Inventors Without Borders and Innovation Foundry, in which teenagers collaborate on problems such as hunger, lack of access to education, and poor air quality.