Africa's population has grown more than sixfold since 1950 and is projected to keep expanding through the end of the century — even as growth slows across most of the world — according to a Pew Research Center analysis published last week.Drawing on United Na…

“[Revolutionary tracts tend] to become mere annals of complaints about existing conditions…I thought, on the contrary, that a revolutionary paper must be…a record of those symptoms which everywhere announce the coming of a new era, the germination of new forms