Memorials and tributes to the South African icon, from Soweto to Brooklyn.
The light of urban development seen from space can tell us much about the shape of the world's economy.
Without play sets, slum children frolic in garbage dumps and toxic rivers.
Water access and infrastructure concerns will only heighten as the country shifts toward an urban majority.
Lessons I learned from two communities on opposite sides of the world
An estimated half of the population of Pakistan's largest city lives in unauthorized homes