In this issue, J. Bernstein et al. review disappearing polymorphs in organic chemistry. How can they be understood by scientists as well as in a court of law? In his Editorial, M. Fontecave discusses sustainable chemistry for supplying energy.

In the Communications section, D. Stalke et al. describe the aggregation of lithium diisopropyl amide in the absence of a donor base, as revealed by NMR experiments (see picture). I. V. Yampolsky et al. discovered a new mechanism of bioluminescence, and F. Li et al. used a neutral π radical as an emitter for OLEDs. C. H. Senanayake et al. succeeded in the asymmetric synthesis of an atropisomeric HIV integrase inhibitor.

• Angewandte Chemie 24/2015: The Many Shapes and Forms of Chemistry,
  Angew. Chem. Int. Ed. 2015, 54 (24).