A new opera house in Algeria. Traffic lights in Liberia's capital city. A malaria prevention centre in Mozambique. These are some of the aid programs China has financed in recent years in Africa. A new study and database released by the Center for Global Development in Washington and AidData, a research group at William and Mary College, has turned up details on 1,673 Chinese development projects worth $75 billion in 50 African countries between 2000 and 2011.