Links I liked

A map of Africa showing the population distribution. 50% of the population lives in four small areas: Nigeria, the Rift Valley, the Moroccan coast, and the Nile valley

Precolonial population distribution has remained remarkably stable.  Map via Africa Visual Data

Graph showing links between informal traders in Benin, Niger and Nigeria

Photo of the science fiction author Octavia Butler, with the caption "You've got to create your own worlds. You've got to write yourself in"