pizza. What is true for the machines all around us now is true for us too: We are what we are connected to. 4 Cascades, epidemics and interactions: Dirk Helbing, “Globally Networked Risks and How to Respond,” Nature, 2013, 51-59. 15 Scientists who study networks: D. Achlioptas, R. M. D'souza, and J. Spencer.