S
It's kind of a mixture of stuff I've read over the decades, plus knowing someone who was a missionary in Kenya. I know some of what I've read came from The Smithsonian and National Geographic, but I can't tell names of articles or issues. (One was about the mines in one country where the mines are worked by slave boys kidnapped from their parents -- often killing the parents, if they don't let the creeps steal the boys. That was sometime last year in The Smithsonian. About the best I can do for remembering stuff.)