Private military and security companies are increasingly being contracted in Africa. But there are big gaps in understanding their impact.
Natural resources are an important factor in explaining why some rebel groups forcibly recruit children into their ranks.
Political leverage aside, it's a major source of water in a parched corner of the world that harbors significant oil deposits.
The American Israeli Public Action Committee has managed to work with Democrats and Republicans alike. Will that change now that Israel has tacked to the right?
With ExxonMobil set to begin oil production in Guyana next year, this tiny South American country will soon become unthinkably rich. But neighboring Venezuela shows how an oil boom can go bust.