I think this quiz uses a different source than most because it includes Shenzhen, which JetPunk usually has with Guangzhou. Liked the quiz, only missed the two least guessed and the capital of Kenya (even guessed Mombasa).
what were they smoking when they ran these statistics, were they just using basic exponential equations to say for example niamey would nearly quintuple in population in 25 years. cities don't work like that, there's a lot that goes into its growth and decline. birth rates in the developing world are continuing to drop so the growth will greatly slow down, some of them are just undergoing short booms right now, some of them will hit geographic constraints and have trouble building up, some of these numbers are outrageous
Great quiz!