The title of this post summarises the contents of a new molecular database: www.molecularspace.org[cite]10.1021/jz200866s[/cite] and I picked up on it by following the post by Jan Jensen at www.compchemhighlights.org (a wonderful overlay journal that tracks recent interesting articles). The molecularspace project more formally is called “The Harvard Clean Energy Project: Large-scale computational screening and design of organic photovoltaics on the world community grid“. It reminds of a 2005 project by Peter Murray-Rust et al at the same sort of concept[cite]10.1007/s00894-005-0278-1[/cite] (the World-Wide-Molecular-Matrix, or WWMM[cite]10.1186/1758-2946-3-42[/cite]), although the new scale is certainly impressive. Here I report my initial experiences looking through molecularspace.org