Wydrzynski, Thomas2015-12-100166-8595http://hdl.handle.net/1885/60241As this special issue shows, we know quite a lot about the workings of Photosystem II and the oxidation of water to molecular O2. However, there are still many questions and details that remain to be answered. In this article, I very briefly outline someKeywords: oxygen; water; biochemistry; electron transport; metabolism; oxidation reduction reaction; photosynthesis; photosystem II; review; Biochemistry; Electron Transport; Oxidation-Reduction; Oxygen; Photosynthesis; Photosystem II Protein Complex; Water Future studies; O 2 evolution; Photosynthesis; Photosystem II; Water splitting200810.1007/s11120-008-9391-12016-02-24