Ricard V. Sole is Professor of Research at the Catalan Institute for Research and Advanced Studies in Spain, head of the Complex Systems Lab at Universitat Pompeu Fabra in Barcelona, external professor at the Santa Fe Institute, and Senior Member of the NASA-Associate Center of Astrobiology. His recent books include "Signs of Life: How Complexity Pervades Biology." Jordi Bascompte is Associate Professor of Research at the Spanish Research Council, and a Visiting Scientist at the National Center for Ecological Analysis and Synthesis at the University of California, Santa Barbara. He was awarded...