The Human Development Lab is housed in Carnegie Mellon University's Human-Computer Interaction Institute, a world leader in the design and evaluation of computing technologies in support of human activity and society. We engage in participatory design with stakeholders in underserved communities to design, implement and deploy appropriate learning technologies that promote critical skills essential for economic empowerment in the 21st century. These skills might include, for example, reading literacy, second language learning, math and science proficiency, healthcare knowledge as well as adult vocational skills. Our learning technologies revolve around affordable platforms such as the cellphone. Much of our work has taken place with rural and urban slums communities in South Asia and sub-Saharan Africa, and we are excited to learn from low-resource communities in the US.