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A century ago, migrants often crossed an ocean and never saw their homelands again. Today, they call--or Skype--home the moment their flight has landed, and that's just the beginning. Thanks to cheap travel and easy communication, immigrants everywhere stay in intimate contact with their native countries, creating powerful cross-border networks. In Borderless Economics, Robert Guest, The Economist's global business editor, travels through dozens of countries and 44 American states, observing how these networks create wealth, spread ideas, and foster innovation. Covering...

This introduction to the theory of rigid structures explains how to analyze the performance of built and natural structures under loads, paying special attention to the role of geometry. The book unifies the engineering and mathematical literatures by exploring different notions of rigidity - local, global, and universal - and how they are interrelated. Important results are stated formally, but also clarified with a wide range of revealing examples. An important generalization is to tensegrities, where fixed distances are replaced with 'cables' not allowed to increase in length and 'struts'...