Others are satellite towns on the outskirts of major cities. Ruiru, home to 400,000 on the fringes of Nairobi, Kenya’s capital, is the sixth-fastest-growing city in Africa. At the top of the ...

T HE RESIDENTS of Goma are no strangers to war. The largest city in the east of the Democratic Republic of Congo (DRC) has long been a refuge for those fleeing from violence elsewhere in one of ...