Drawing inspiration from diverse energy processes in nature presents the opportunity to achieve efficient energy harvesting from water, sunlight, heat, and their hybrids through interfacial engineering. The cover image illustrates structural design for sunlight harvesting inspired by butterfly wing textures. See Wang et al.

Human body digital twins can be created through the analysis and modelling of real physiological data coming from on-body sensors and medical devices. The cover image illustrates the duality between the real world and the virtual representation. See Occhipinti et al.

Block copolymer (BCP) self-assembly provides sub-10-nm periodic nanopatterned structures to fabricate internet of things (IoT) hardware components with a cost-effective, large-area approach and versatile functionalities. The cover image illustrates the BCP architecture library and the potential components for IoT applications. See Kim et al.

Welcome to the first issue of Nature Reviews Electrical Engineering, a new Nature Reviews journal covering all areas of electrical engineering from electronics and photonics to robotics, telecommunications, energy and signal processing, with a particular focus on applied and industrial research.