Betsy Pisik has covered the United Nations and the Middle East for over a decade. She has reported on security, health and development for a variety of publications from Afghanistan, Iraq, the DRC, Ethiopia, Syria and the Middle East. She is a fellow at the International Reporting Project in Washington, DC. See her work at  

In one of the most devastating mass poisonings ever seen, hundreds of children in Nigeria have been killed by breathing deadly dust, a byproduct of gold mining. Betsy Pisik reports from Africa.