In this issue, S. Liu et al. review flexible perovskite solar cells. What are recent advances in fabrication and applications? J. Xiong et al. summarize modulation of electronic structures of inorganic nanomaterials for electrocatalytic water splitting in a further Review. The Minireviews deal with polymer donors for high-performance non-fullerene organic solar cells (Y. Sun et al.) and the evolution of artificial metalloenzymes (U. Schwaneberg et al.).

In the Communications section, A. Aukauloo et al. present second-sphere biomimetic multipoint hydrogen-bonding patterns to boost CO₂ reduction of iron porphyrins (see picture). C. K. Williams et al. prepared metabolically active, fully hydrolyzable polymersomes. D. M. Kolpashchikov et al. achieved selective and efficient cleavage of folded RNA, working towards DNA nanomachines for cancer treatment. V. M. Dong et al. succeeded in the dynamic kinetic resolution of aldehydes by hydroacylation.

• Angewandte Chemie 14/2019: Alternatives through Chemistry,
  Angew. Chem. Int. Ed. 2019, 58 (14).