Humankind's fascination with rapid growth, nay, eternal growth is an accepted tenet, to the extent that we don't even think twice about it. But what about the impact it has on how we live? The world recently passed a milestone (or is that a millstone?) - more people live in urban areas than in the countryside. This report explores the health challenges that megacities pose. Also check out this picture of how many megacities there are in the world
