Cover Feature: Precise Proton Mapping near Ionic Micellar Membranes with Fluorescent Photoinduced‐Electron‐Transfer Sensors (Chem. Eur. J. 36/2019)

Small worlds, much smaller than our own, are explored for their secrets by designed probes. The near-earth asteroid Ryugu, 900 m in diameter, is much smaller than our earth of diameter 12 742 km but it has recently been accessed by the probe Hayabusa-2 of the Japanese Space Agency (© JAXA/Akihiro Ikeshita). Detailed studies of its surface and shallow interior are underway. Electrically charged detergent micelles, 7 nm in diameter, are much smaller and their proton landscapes are accessed by fluorescent molecular probes.