Editorial Expression of Concern: Nanospherical arabinogalactan proteins are a key component of the high-strength adhesive secreted by English ivy

Cover image: Pictured is the supernova remnant Cassiopeia A, as viewed by the Hubble Space Telescope. A range of physical phenomena, including supernovae, is governed by interfacial transport and mixing. Articles in the Interfaces and Mixing: Nonequilibrium Transport Across the Scales Special Feature describe recent advances in understanding interfacial mixing and nonequilibrium dynamics, in fields such as applied mathematics, chemistry, material processing, fluid dynamics, and astrophysics. See the Introduction to the Special Feature by Snezhana I. Abarzhi and William A. Goddard III on pages 18171–18174. The Special Feature is edited by Snezhana I. Abarzhi, William A. Goddard III, and Katepalli R. Sreenivasan. Image courtesy of NASA, ESA, and the Hubble Heritage (STScI/AURA)-ESA/Hubble Collaboration; acknowledgment to Robert A. Fesen (Dartmouth College, Hanover, NH) and James Long (ESA/Hubble).