In this issue, X. Feng and A. D. Schlüter discuss macroscopic crystalline 2D polymers: How can 500,000 chemical bonds be formed in a controlled fashion within a single polymer sheet? In Minireviews, L. Sun et al. discuss nanostructures made from rice husk biomass for energy applications, and A. W. Kleij et al. summarize catalytic transformations of functionalized cyclic organic carbonates. In their Guest Editorial, K. Boele-Woelki et al. write on why and how to rebuild trust in science.

In the Communications section, P. B. Crowley et al. describe auto-regulated protein assembly on a supramolecular scaffold (see picture). J. Küpper et al. succeeded in spatially separating the conformers of a dipeptide in a molecular beam. S. Jiang et al. reveal the immunogenic risk of polymers such as PEG and PCB, and J. Werth and C. Uyeda present a cobalt-catalyzed reductive dimethylcyclopropanation of 1,3-dienes.

• Angewandte Chemie 42/2018: Trusted Source,
  Angew. Chem. Int. Ed. 2018, 57 (42).