Is our world becoming too complex and too fast-paced to manage? The challenges facing human societies - from international financial crises and global climate change to pandemics of tuberculosis and AIDS - converge, intertwine, and often remain largely beyond our ken. Most of us suspect that the 'experts' don't really know what's going on and that as a species we have released forces that are neither managed nor manageable. This is the 'ingenuity gap' - the term coined by Thomas Homer-Dixon - the critical gap between our need for practical and innovative ideas to solve complex problems and our actual supply of those ideas. Homer-Dixon shows us how, in our complex world, while poor countries are particularly vulnerable to ingenuity gaps, our own rich countries are no longer immune. When the gap widens political disintegration and violent upheaval can result, reaching into our own economies and daily lives in subtle, unforeseen ways.