title: Introduction to Focus Issue: The 25th Anniversary of Chaos: Perspectives on Nonlinear Science-Past, Present, and Future.
authors.affiliation: Department of Computer Science, University of Colorado, Boulder, Colorado 80309, USA and Santa Fe Institute, Santa Fe, New Mexico 87501, USA.
authors.forename: Elizabeth
authors.initials: E
authors.lastname: Bradley
authors.affiliation: Department of Physics and Astronomy and Northwestern Institute on Complex Systems (NICO), Northwestern University, Evanston, Illinois 60208, USA.
authors.forename: Adilson E
authors.initials: AE
authors.lastname: Motter
authors.affiliation: U.S. Naval Research Laboratory, Washington, District of Columbia 20375, USA.
authors.forename: Louis M
authors.initials: LM
authors.lastname: Pecora